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United States Department of Agriculture

Agricultural Research Service

Related Topics

Liwang Ma
Agricultural Systems Research Unit
Research Soil Scientist

Phone: (970) 492-7339
Fax: (970) 492-7310
Room 2038
USDA-ARS-NPA-ASRU
2150 CENTRE AVE., BLDG. D, STE. 200
FORT COLLINS, CO, 80526

Projects
Spatial Modeling of Agricultural Watersheds: Water and Nutrient Management and Targeted Conservation Effects at Field to Watershed Scales
Appropriated (D)
  Accession Number: 422726
Enhanced System Models and Decision Support Tools to Optimize Water Limited Agriculture
Appropriated (D)
  Accession Number: 425704
RESEARCH AND MODIFY RZWQM2 MODEL FOR SIMULATING PESTICIDE TRANSPORT AND FATE IN SURFACE WATER FROM CALIFORNIA AGRICULTURAL FIELDS
Nonfunded Cooperative Agreement (N)
  Accession Number: 422508
Inter-Compare and Improve Soil-Crop Models for Evaluating Effects of Climate Change and Adaptations on Production and Natural Resources
Specific Cooperative Agreement (S)
  Accession Number: 427157
ENHANCED SYSTEM MODELS, MANAGEMENT AND CULTIVAR ADAPTATIONS TO LIMITED WATER AND CLIMATE CHANGE, AND TOOLS FOR PRECISION MANAGEMENT
Specific Cooperative Agreement (S)
  Accession Number: 423436
Improve and Enhance the Object Modeling System (OMS) for Building New Models and Conservation Tools and Transferring This Technology
Specific Cooperative Agreement (S)
  Accession Number: 425201

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Evaluation of RZWQ2 model and management of poultry litter as corn nitrogen source in the mid-southern United States - (Abstract Only) - (28-Jul-14)
Modeling weather and stocking rate threshold effects on forage and steer production in northern mixed-grass prairie - (Peer Reviewed Journal)
Fang, Q.X., Andales, A.A., Derner, J.D., Ahuja, L.R., Ma, L., Bartling, P.N., Reeves, J.L. 2014. Modeling weather and stocking rate threshold effects on forage and steer production in northern mixed-grass prairie. Agricultural Systems. doi:10.1016/j.agsy.2014.05.011.
Modeling evapotranspiration and energy balance in a wheat-maize cropping system using the revised RZ-SHAW model - (Peer Reviewed Journal) - (17-Apr-14)
Sustainability and environmental assessment of fertigation in an intensive olive grove under Mediterranean conditions - (Peer Reviewed Journal) - (04-Apr-14)
Modeling the long-term effect of winter cover crops on nitrate transport in artificially drained fields across the Midwest U.S. - (Abstract Only) - (08-Jan-14)
Simulated potential water quality impact of fall-planted cover crops across the Midwestern USA - (Peer Reviewed Journal) - (08-Jan-14)
Effects of tillage and application rate on atrazine transport to subsurface drainage: Evaluation of RZWQM using a six-year field study - (Peer Reviewed Journal)
Malone, R.W., Nolan, B.T., Ma, L., Kanwar, R., Peterson, C., Heilman, P. 2013. Tillage and application rate affects atrazine transport to subsurface drainage with macropore flow: Evaluation of RZWQM using a long-term field study. Agricultural Water Management. 132:10-22.
Enhancing the water stress factors for simulation of corn (Zea mays L.) in RZWQM2 - (Peer Reviewed Journal)
Anapalli, S.S., Ahuja, L.R., Ma, L., Nielsen, D.C., Trout, T.J., Andales, A.A., Chavez, J.L., Ham, J. 2013. Enhancing the water stress factors for simulation of corn (Zea mays L.) in RZWQM2. Agronomy Journal. 10.2134.
Quantifying climate and management effects on regional crop yield and N leaching in the North China Plain - (Peer Reviewed Journal)
Fang, Q.X., Ma, L., Yu, Q., Hu, C.S., Li, X.X., Malone, R.W., Ahuja, L.R. 2013. Quantifying climate and management effects on regional crop yield and N leaching in the North China Plain. Journal of Environmental Quality. 42:1466–1479.
Modeling The effect of elevated CO2 and climate change on reference evapotranspiration in the semi-arid Great Plains - (Peer Reviewed Journal) - (02-Oct-12)
Simulating dryland water availability and spring wheat production under various management practices in the Northern Great Plains - (Peer Reviewed Journal)
Qi, Z., Bartling, P.N., Jabro, J.D., Lenssen, A.W., Iversen, W.M., Ahuja, L.R., Ma, L., Allen, B.L., Evans, R.G. 2013. Simulating dryland water availability and spring wheat production under various management practices in the Northern Great Plains. Agronomy Journal. 105:37-50.
Simulated yield and profitability of five potential crops for intensifying the dryland wheat-fallow production system - (Peer Reviewed Journal)
Anapalli, S., Nielsen, D.C., Ahuja, L.R., Ma, L., Lyon, D.J. 2012. Simulated yield and profitability of five potential crops for intensifying the dryland wheat-fallow production system. Agricultural Water Management. 116(2013):175-192.
Simulation of over-winter soil water and soil temperature with SHAW and RZ-SHAW - (Peer Reviewed Journal)
Li, Z., Ma, L., Flerchinger, G.N., Ahuja, L.R., Wang, H. 2012. Simulation of over-winter soil water and soil temperature with SHAW and RZ-SHAW. Soil Science Society of America Journal. 76:1548-1563.
Root Zone Water Quality Model (RZWQM2): Model use, calibration, and validation - (Peer Reviewed Journal)
Ma, L., Ahuja, L.R., Nolan, B., Malone, R.W., Trout, T.J., Qi, Z. 2012. Root Zone Water Quality Model (RZWQM2): Model use, calibration, and validation. Transactions of the ASABE. 55(4):1425-1446.
Simulating the production potential of dryland spring canola in the Central Great Plains - (Peer Reviewed Journal)
Nielsen, D.C., Saseendran, S.A., Ma, L., Ahuja, L.R. 2012. Simulating the production potential of dryland spring canola in the Central Great Plains. Agronomy Journal. 104:1182-1188.
The Nashua agronomic, water quality, and economic dataset - (Peer Reviewed Journal)
Heilman, P., Kanwar, R., Malone, R.W., Ma, L., Hatfield, J.L., Boyle, K. 2012. The Nashua agronomic, water quality, and economic dataset. Journal of Soil and Water Conservation. 67(6):502-512.
Assessment of agricultural return flows under changing climate and crop water management - (Abstract Only)
Green, T.R., Ma, L., Anapalli, S., Ahuja, L.R., Trout, T.J. 2012. Assessment of agricultural return flows under changing climate and crop water management. Proceedings Solutions International Association of Hydrogeologists. Niagara Falls, Ontario, Canada, September 16-21.
Modeling the impacts of climate change on irrigated corn production in the central Great Plains - (Peer Reviewed Journal)
Islam, A., Ahuja, L.R., Garcia, L.A., Ma, L., Anapalli, S.A., Trout, T.J. 2012. Modeling the impacts of climate change on irrigated corn production in the central Great Plains. Agricultural Water Management. 110:94-108.
Development and evaluation of the carbon-nitrogen cycle module for the GPFARM-Range model - (Peer Reviewed Journal)
Qi, Z., Bartling, P.N., Ahuja, L.R., Derner, J.D., Dunn, G.H., Ma, L. 2012. Development and evaluation of the carbon-nitrogen cycle module for the GPFARM-Range model. Computers and Electronics in Agriculture. 83:1-10.
Simulating the surface energy balance in a soybean canopy with SHAW and RZ-SHAW models - (Peer Reviewed Journal)
Ma, L., Flerchinger, G.N., Ahuja, L.R., Sauer, T.J., Prueger, J.H., Malone, R.W., Hatfield, J.L. 2012. Simulating the surface energy balance in a soybean canopy with SHAW and RZ-SHAW models. Transactions of the ASABE. 55(1):175-179.
Verifiable metamodels for nitrate losses to drains and groundwater in the corn belt, USA - (Peer Reviewed Journal)
Nolan, B.T., Malone, R.W., Gronberg, J., Thorp, K.R., Ma, L. 2012. Verifiable metamodels for nitrate losses to drains and groundwater in the corn belt, USA. Environmental Science and Technology. 46:901-908.
A protocol for parameterization and calibration of RZWQM2 in field research - (Book / Chapter)
Ma, L., Ahuja, L.R., Saseendran, S.A., Malone, R.W., Green, T.R., Nolan, B.T., Bartling, P.N., Flerchinger, G.N., Boote, K.J., Hoogenboom, G. 2011. A protocol for parameterization and calibration of RZWQM2 in field research. Soil Science Society of America Special Publication Book Chapter. p.1-64.
A synthesis of current parameterization approaches and needs for further improvements - (Book / Chapter)
Ahuja, L.R., Ma, L. 2011. A synthesis of current parameterization approaches and needs for further improvements. In: Ahuja, L.R., Ma, L., editors. Methods of Introducing System Models into Agricultural Research. Madison, WI: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America. p.427-440.
Modeling the effects of controlled drainage, N rate and weather on nitrate loss to subsurface drainage - (Peer Reviewed Journal)
Fang, Q.X., Malone, R.W., Ma, L., Jaynes, D.B., Thorp, K.R., Green, T.R., Ahuja, L.R. 2012. Modeling the effects of controlled drainage, N rate and weather on nitrate loss to subsurface drainage. Agricultural Water Management. 103:150-161.
Calibrating RZWQM2 model for maize responses to deficit irrigation - (Peer Reviewed Journal)
Ma, L., Trout, T.J., Ahuja, L.R., Bausch, W.C., Saseendran, S.A., Malone, R.W., Nielsen, D.C. 2011. Calibrating RZWQM2 model for maize responses to deficit irrigation. Agricultural Water Management. 103 (2012):140-149.
Extending results from agricultural fields with intensively monitored data to surrounding areas for water quality management - (Peer Reviewed Journal)
Heilman, P., Malone, R.W., Ma, L., Hatfield, J.L., Ahuja, L.R., Boyle, K., Kanwar, R. 2012. Extending results from agricultural fields with intensively monitored data to surrounding areas for water quality management. Agricultural Systems. 106:59-71.
Simulating nitrate-nitrogen concentration from a subsurface drainage system in response to nitrogen application rates using RZWQM2 - (Peer Reviewed Journal)
Qi, Z., Ma, L., Helmers, M.J., Ahuja, L.R., Malone, R.W. 2012. Simulating nitrate-nitrogen concentration from a subsurface drainage system in response to nitrogen application rates using RZWQM2. Journal of Environmental Quality. 41(1):289-295.
Climate change impacts on dryland cropping systems in the central Great Plains, USA - (Peer Reviewed Journal)
Ko, J., Ahuja, L.R., Anapalli, S., Green, T.R., Ma, L., Nielsen, D.C., Walthall, C.L. 2011. Climate change impacts on dryland cropping systems in the central Great Plains, USA. Climatic Change. 111:445-472.
Cover crop effects on nitrogen load in tile drainage from Walnut Creek Iowa using root zone water quality model (RZWQM) - (Peer Reviewed Journal)
Singer, J.W., Malone, R.W., Jaynes, D.B., Ma, L. 2011. Cover crop effects on nitrogen load in tile drainage from Walnut Creek, Iowa, using root zone water quality model (RZWQM). Agricultural Water Management. 98(10):1622-1628.
Quality assurance of weather data for agricultural system model input - (Book / Chapter)
Malone, R.W., Meek, D.W., Ma, L., Jaynes, D.B., Nolan, B.T., Karlen, D.L. 2011. Quality assurance of weather data for agricultural system model input. In: Ahuja, L.R., Ma, L., editors. Methods of Introducing System Models into Agricultural Research. Madison, WI: American Society of Agronomy, Crop Science of America and Soil Science Society of America. p. 283-296.
Inverse modeling with RZWQM2 to predict water quality - (Book / Chapter)
Nolan, B.T., Malone, R.W., Ma, L., Green, C.T., Fienen, M.N., Jaynes, D.B. 2011. Inverse modeling with RZWQM2 to predict water quality. In: Ahuja, L.R., Ma, L., editors. Methods of Introducing System Models into Agricultural Research. Madison, WI: Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting. p. 327-363.
Measurement of surface energy balance components in dryland wheat/fallow and limited-irrigation corn - (Abstract Only)
Green, T.R., Saseendran, S.A., Erskine, R.H., Ahuja, L.R., Murphy, M.R., Ma, L., Bausch, W.C., Andales, A.A. 2011. Measurement of surface energy balance components in dryland wheat/fallow and limited-irrigation corn. Annual American Geophysical Union Hydrology Days. Paper No. 11.
Quasi-biennial corn yield cycles in Iowa - (Abstract Only)
Malone, R.W., Meek, D.W., Hatfield, J.L., Ma, L. 2010. Quasi-biennial corn yield cycles in Iowa. American Society of Agronomy Annual Meetings [abstract]. ASA-CSSA-SSSA Annual Meeting. Oct. 31 - Nov. 4, 2010, Long Beach, CA. CD-ROM.
Adapting CROPGRO for Simulating Spring Canola Growth with Both RZWQM2 and DSSAT 4.0 - (Peer Reviewed Journal)
Saseendran, S.A., Nielsen, D.C., Ma, L., Ahuja, L.R. 2010. Adapting CROPGRO for Simulating Spring Canola Growth with Both RZWQM2 and DSSAT 4.0. Agronomy Journal 102:1606-1621. Doi:10.2134/agronj2010.0277.
Simulating Alternative Dryland Rotational Cropping Systems in the Central Great Plains with RZWQM2 - (Peer Reviewed Journal)
Saseendran, S.A., D.C. Nielsen, Liwang Ma, L.R. Ahuja, M.F. Vigil, 2010. Simulating Alternative Dryland Rotational Cropping Systems in the Central Great Plains with RZWQM2. Agronomy Journal. 102:1521-1534. doi:10.2134/agronj2010.0141.
Simulation of free air CO2 enriched wheat growth and interaction with water, nitrogen, and temperature - (Peer Reviewed Journal)
Ko, J., Ahuja, L.R., Kimball, B.A., Anapalli, S., Ma, L., Green, T.R., Ruane, A., Wall, G.W., Pinter Jr, P.J., Bader, D. 2010. Simulation of free air CO2 enriched wheat growth and interaction with water, nitrogen, and temperature. Agricultural and Forest Meteorology. 150:1331-1346.
Effective soil hydraulic properties in space and time: some field data analysis and modeling concepts - (Abstract Only)
Green, T.R., Ahuja, L.R., Ma, L., Ascough II, J.C., Dunn, G.H. Effective Soil Hydraulic Properties in Space and Time: Some Field Data Analysis and Modeling Concepts. Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting. Paper No. 61385.
Optimizing Soil Hydraulic Parameters in RZWQM2 Under Fallow Conditions - (Peer Reviewed Journal)
Fang, Q.X., Green, T.R., Ma, L., Malone, R.W., Erskine, R.H., Ahuja, L.R. 2010. Optimizing Soil Hydraulic Parameters in RZWQM2 Under Fallow Conditions. Soil Science Society of America Journal. 74(6):1897-1913. DOI:10.2136/sssaj2009.0380.
Soil-test N recommendations augmented with PEST optimized RZWQM simulations - (Peer Reviewed Journal)
Malone, R.W., Jaynes, D.B., Ma, L., Nolan, B., Meek, D.W., Karlen, D.L. 2010. Soil-test N recommendations augmented with PEST optimized RZWQM simulations. Journal of Environmental Quality. 39:1711-1723.
Crop Water Use Efficiency at Multiple Scales - (Peer Reviewed Journal)
Green, T.R., Yu, Q., Ma, L., Wang, T. 2010. Crop Water Use Efficiency at Multiple Scales. Agricultural Water Management. 97(8):1099-1101. Available: http://dx.doi.org/10.1016/j.agwat.2010.03.018.
Estimating effective soil properties of heterogeneous areas for modeling infiltration and redistribution - (Peer Reviewed Journal)
Ahuja, L.R., Ma, L., Green, T.R. 2010. Estimating effective soil properties of heterogeneous areas for modeling infiltration and redistribution. Soil Science Society of America Journal. 74(5):1469-1482.
Water Resources and Agricultural Water Use in the North China Plain: Current Status and Management Options - (Peer Reviewed Journal)
Fang, Q., Ma, L., Green, T.R., Yu, Q., Wang, T.D., Ahuja, L.R. 2010. Water Resources and Agricultural Water Use in the North China Plain: Current Status and Management Options. Agricultural Water Management. 97(8):1102-1116. Available: doi:10.1016/j.agwat.2010.01.008.
Predicting Unsaturated Zone Nitrogen Mass Balances in Agricultural Settings of the United States - (Peer Reviewed Journal)
Nolan, T., Puckett, L., Ma, L., Green, C.T., Bayless, E.R., Malone, R.W. 2010. Predicting Unsaturated Zone Nitrogen Mass Balances in Agricultural Settings of the United States. Journal of Environmental Quality. 39(3):1051-1065.
Rzwqm Predicted Effects of Soil N Testing with Incorporated Automatic Parameter Optimization Software (Pest) and Weather Input Quality Control - (Abstract Only)
Malone, R.W., Jaynes, D.B., Ma, L., Nolan, B., Meek, D.W. 2009. RZWQM predicted effects of soil N testing with incorporated automatic parameter optimization software (PEST) and weather input quality control. American Society of Agronomy Annual Meetings [abstracts]. ASA-CSSA-SSSA Annual Meeting, Nov. 1-4, 2009, Pittsburgh, PA. CD-ROM.
Rzwqm2 Simulations of Alternative Cropping Systems with and Without Summer Crops in the Central Great Plains - (Abstract Only)
Anapalli, S.S., Nielsen, D.C., Ma, L., Ahuja, L.R. 2009. RZWQM2 Simulations of Alternative Cropping Systems With and Without Summer Crops in the Central Great Plains. Agronomy Abstracts. Presented at the ASA/CSSA/SSSA annual meeting. Nov. 1-5, 2009. Pittsburg, PA.
A step by step procedure for parameterization, calibration, validation, and application of a system model in field research - (Abstract Only)
Ma, L., Ahuja, L.R., Malone, R.W., Green, T.R. A Step by Step Procedure for Parameterization, Calibration, Validation, and Application of a System Model in Field Research. ASA-CSSA-SSSA Annual Meeting Abstracts.
Use of a Cropping System Model for Soil-Specific Optimization of Limited Water - (Proceedings)
Ahuja, L.R., Anapalli, S.S., Ma, L., Nielsen, D.C., Trout, T.J., Andales, A.A., Hansen, N.C. 2009. Use of a Cropping System Model for Soil-Specific Optimization of Limited Water. International Conference on Precision Agriculture Abstracts & Proceedings.
Space-Time Dynamics of Soil Water and Process Interactions in Semi-Arid Terrain, Colorado, USA Reprint Icon - (Proceedings)
Green, T.R., Erskine, R.H., Murphy, M.R., Ma, L., Ascough II, J.C., Mcmaster, G.S., Dunn, G.H., Ahuja, L.R. 2009. Space-Time Dynamics of Soil Water and Process Interactions in Semi-Arid Terrain, Colorado, USA. International Congress on Modeling and Simulation Proceedings. p. 1851-1857.
Simulation of Climate Change Impacts on Wheat-Fallow Cropping Systems - (Abstract Only)
Ko, J., Ahuja, L.R., Kimball, B.A., Anapalli, S., Ma, L., Green, T.R., Wall, G.W., Pinter Jr, P.J. 2009. Simulation of Climate Change Impacts on Wheat-Fallow Cropping Systems. ASA-CSSA-SSSA Annual Meeting Abstracts.
Modeling Responses of Dryland Spring Triticale, Proso Millet and Foxtail Millet to Initial Soil Water in the High Plains - (Peer Reviewed Journal)
Anapalli, S.S., Nielsen, D.C., Lyon, D.J., Ma, L., Felter, D.G., Baltensperger, D.D., Hoogenboom, G., Ahuja, L.R. 2009. Modeling Responses of Dryland Spring Triticale, Proso Millet and Foxtail Millet to Initial Soil Water in the High Plains. Field Crops Research 113:48-63.
Irrigation Strategies To Improve Water Use Efficiency in the Wheat-Maize Double Cropping System in China - (Peer Reviewed Journal)
Fang, Q., Ma, L., Yu, Q., Ahuja, L.R., Malone, R.W., Hoogenboom, G. 2009. Irrigation Strategies To Improve Water Use Efficiency in the Wheat-Maize Double Cropping System in China. Agricultural Water Management. 97 (8):1165-1174.
Quasi-Biennial Corn Yield Cycles - (Peer Reviewed Journal)
Malone, R.W., Meek, D.W., Hatfield, J.L., Mann, M., Jaquis, R.J., Ma, L. 2009. Quasi-Biennial Corn Yield Cycles. Agricultural and Forest Meteorology. 149(6&7):1087-1094.
Effects of Estimating Soil Hydraulic Properties and Root Growth Factor on Soil Water Balance and Crop Production - (Peer Reviewed Journal)
Ma, L., Hoogenboom, G., Saseendran, S.A., Bartling, P.N., Ahuja, L.R., Green, T.R. 2009. Effects of Estimating Soil Hydraulic Properties and Root Growth Factor on Soil Water Balance and Crop Production. Agronomy Journal. 101(3) :572-583.
Soil Nitrogen Balance Under Wastewater Management: Field Measurements and Simulation Results - (Peer Reviewed Journal)
Sophocleous, M., Townsend, M.A., Vocasek, F., Ma, L., Ashok, K.C. 2009. Soil Nitrogen Balance Under Wastewater Management: Field Measurements and Simulation Results. Journal of Environmental Quality. 38:1286-1301.
Evaluating the Crop Water Stress Index and its Correlation with Latent Heat and CO2 Fluxes Over Winter Wheat and Maize in the North China Plain - (Peer Reviewed Journal)
Li, L., Nielsen, D.C., Yu, Q., Ma, L., Ahuja, L.R. 2008. Evaluating the Crop Water Stress Index and its Correlation with Latent Heat and CO2 Fluxes Over Winter Wheat and Maize in the North China Plain. Agricultural Water Management. 97:1146-1155. doi:10.1016/j.agwat.2008.09.015.
Winter Cover Crop Effects on Nitrate Leaching in Subsurface Drainage as Simulated by RZWQM-DSSAT - (Peer Reviewed Journal)
Li, L., Malone, R.W., Ma, L., Kaspar, T.C., Jaynes, D.B., Saseendran, S.A., Thorp, K.R., Yu, Q., Ahuja, L.R. 2008. Winter Cover Crop Effects on Nitrate Leaching in Subsurface Drainage as Simulated by RZWQM-DSSAT. Transactions of the ASABE. 51:1575-1583.
Drainmod-N Ii: Evaluated for An Agricultural System in Iowa and Compared to Rzwqm-Dssat - (Peer Reviewed Journal)
Thorp, K.R., Youssef, M.A., Jaynes, D.B., Malone, R.W., Ma, L. 2009. DRAINMOD-N II: Evaluated for an agricultural system in Iowa and compared to RZWQM-DSSAT. Transactions of the ASABE. 52(5):1557-1573.
Current Water Deficit Stress Simulations in Selected Agricultural System Simulation Models - (Book / Chapter)
Anapalli, S.S., Ahuja, L.R., Ma, L., Timlin, D.J., Stockle, C.O., Boote, K.J., Hoogenboom, G. 2008. Current Water Deficit Stress Simulations in Selected Agricultural System Simulation Models. In: Ahuja, L.R., Reddy, V.R., Saseendran, S.A., Yu, Q., editors. Response of Crops to Limited Water: Understanding and Modeling Water Stress Effects on Plant Growth Processes. Madison, WI, American Society of Agronomy, Crop Science Society of America, Soil Science Society of America. p. 1-38.
Modeling Nitrogen and Water Management Effects in a Wheat-Maize Double-Cropping System Reprint Icon - (Peer Reviewed Journal)
Fang, Q., Ma, L., Yu, Q., Malone, R.W., Saseendran, S.A., Ahuja, L.R. 2008. Modeling Nitrogen and Water Management Effects in a Wheat-Maize Double-Cropping System. Journal of Environmental Quality. 37:2232-2242.
Spatial Features, Scaling and Simulation in Semi-Arid Agricultural Terrain Reprint Icon - (Abstract Only)
Green, T.R., Erskine, R.H., Ma, L. 2008. Spatial Features, Scaling and Simulation in Semi-Arid Agricultural Terrain. American Society of Agronomy Meetings. Paper No. 257-9.
Simulated Corn Stover Removal Effects on Soil Organic Carbon and Nitrogen Dynamics - (Abstract Only)
Ma, L., Malone, R.W., Ahuja, L.R., Karlen, D.L., Saseendran, S.A. 2009. Simulated Corn Stover Removal Effects on Soil Organic Carbon and Nitrogen Dynamics. American Society of Agronomy Meetings, Houston, TX, October 5, 2009.
Simulated Effects of Nitrogen Management and Soil Microbes on Soil Nitrogen Balance and Crop Production - (Peer Reviewed Journal)
Ma, L., Malone, R.W., Jaynes, D.B., Thorp, K.R., Ahuja, L.R. 2008. Simulated Effects of Nitrogen Management and Soil Microbes on Soil Nitrogen Balance and Crop Production. Soil Science Society of America Journal. 72:1594-1603.
Modeling Crop Responses to Initial Soil Water in the High Plains - (Abstract Only)
Saseendran, S.A., Nielsen, D.C., Lyon, D.J., Ma, L., Ahuja, L.R. 2008. Modeling Crop Responses to Initial Soil Water in the High Plains. Agronomy Abstract. Presented at the International American Society of Agronomy meetings, Crop Science Society of America and Soil Science Society of America (ASA/CSSA/SSSA) annual meetings. oct. 5-9, 2008. Houston, TX.
Use of Crop Simulation Models to Evaluate Limited Irrigation Management Options for Corn in Semi-Arid Environment Reprint Icon - (Peer Reviewed Journal)
Anapalli, S.S., Ahuja, L.R., Nielsen, D.C., Trout, T.J., Ma, L. 2008. Use of Crop Simulation Models to Evaluate Limited Irrigation Management Options for Corn in Semi-Arid Environment. Water Resources Research. Water Resources Research, 44,W00E02, doi10.1029/2007WR006181.
N uptake effects on N loss in tile drainage as estimated by RZWQM - (Book / Chapter)
Malone, R.W., Ma, L. 2008. N uptake effects on N loss in tile drainage as estimated by RZWQM. In: Ma, L., Bruulsema, T., Ahuja, L., editors. New Advances in Understanding and Quantification of Plant N Uptake. Boca Raton, FL. CRC Press. p. 259-275.
Ecological Models: Agricultural Models - (Book / Chapter)
Ascough II, J.C., Ahuja, L.R., Mcmaster, G.S., Ma, L., Andales, A.A. 2008. Agricultural Models. In: Jorgensen, S.E., Faith, B.D.editors. Ecological Models. Vol. (1) Encyclopedia of Ecology., 5 vols. Oxford, Elsevier. p. 85-95.
Simulated Corn Yield Responses to Limited-Water Irrigation Under Varying Soil and Climate Conditions Reprint Icon - (Abstract Only)
Anapalli, S.S., Ahuja, L.R., Ma, L., Nielsen, D.C., Trout, T.J., Hansen, N., Andales, A.A. 2007. Simulated Corn Yield Responses to Limited-Water Irrigation Under Varying Soil and Climate Conditions. ASA-CSSA-SSSA Annual Meeting Abstracts, New Orleans, LA. November 5,2007, 33-2.
Spatial Variability and Scaling of Infiltration on Undulating Agricultural Terrain Reprint Icon - (Abstract Only)
Green, T.R., Ahuja, L.R., Dunn, G.H., Ascough Ii, J.C., Mcmaster, G.S., Ma, L., Erskine, R.H., Salas, J.D., Palic, D.B., Murphy, M.R. 2007. Spatial Variability and Scaling of Infiltration on Undulating Agricultural Terrain. American Society of Agronomy Meetings New Orleans, November 7,2007 (282-3).
Scaling Parameters of the Lewis-Kostiakov Water Infiltration Equation Across Soil Textural Classes and Extension to Rain Infiltration Reprint Icon - (Peer Reviewed Journal)
Ahuja, L.R., Kozak, J.A., Andales, A.A., Ma, L. 2006. Scaling Parameters of the Lewis-Kostiakov Water Infiltration Equation Across Soil Textural Classes and Extension to Rain Infiltration. Transactions of the ASABE. Vol.50(5): 1525-1541.2007.
System Modeling for Soil and Water Research and Management: Current Status and Needs for the 21st Century Reprint Icon - (Peer Reviewed Journal)
Ma, L., Ahuja, L.R., Malone, R.W. 2007. System Modeling for Soil and Water Research and Management: Current Status and Needs for the 21st Century. Transactions of the ASABE. 50(5):1705-1713.
Simulated N Management Effects on Corn Yield and Tile-Drainage Nitrate Loss - (Peer Reviewed Journal)
Malone, R.W., Ma, L., Heilman, P., Karlen, D.L., Kanwar, R.S., Hatfield, J.L. 2007. Simulated N Management Effects on Corn Yield and Tile-Drainage Nitrate Loss. Geoderma. 140:272-283.
Empirical Analysis and Prediction of Nitrate Loading and Crop Yield for a Corn-Soybean Rotations - (Peer Reviewed Journal)
Malone, R.W., Ma, L., Karlen, D.L., Meade, T.G., Meek, D.W., Heilman, P., Kanwar, R.S., Hatfield, J.L. 2007. Empirical analysis and prediction of nitrate loading and crop yield for a corn-soybean rotations. Geoderma. 140:223-234.
Evaluating and predicting agricultural management effects under tile-drainage using modified APSIM - (Peer Reviewed Journal)
Malone, R.W., Huth, N., Carberry, P.S., Ma, L., Kaspar, T.C., Karlen, D.L., Meade, T.G., Kanwar, R.S., Heilman, P. 2007. Evaluating and predicting agricultural management effects under tile-drainage using modified APSIM. Geoderma. 140:310-322.
Using the RZWQM to Simulate the Fate of Nitrogen in Field Soil - Crop Environment in the Mediterranean Region Reprint Icon - (Peer Reviewed Journal)
Cameira, M.R., Fernando, R.M., Ahuja, L.R., Ma, L. 2007. Using the RZWQM to Simulate the Fate of Nitrogen in Field Soil - Crop Environment in the Mediterranean Region. Agricultural Water Management. 90:121-136. 2007.
Whole System Integration and Modeling Essential to Agricultural Science and Technology for the 21st Century Reprint Icon - (Peer Reviewed Journal)
Ahuja, L.R., Andales, A.A., Ma, L., Saseendran, S.A. 2007. Whole System Integration and Modeling Essential to Agricultural Science and Technology for the 21st Century. Journal of Crop Improvement. 19 (1-2).
Modeling Pesticide Fate and Nonideal Transport From A Slow Release, Pesticide Treated Seed Reprint Icon - (Peer Reviewed Journal)
Sabbagh, G.J., Fox, G.A., Ma, L., Malone, R.W., Arthur, E.L., Dyer, D.G. 2007. Modeling Pesticide Fate and Nonideal Transport From A Slow Release, Pesticide Treated Seed. Transactions of the ASABE 50(2):523-532, 2007.
Comparision of modeling approaches to quantify residue architecture effects on soil temperature and water - (Peer Reviewed Journal)
Kozak, J.A., Aiken, R.M., Flerchinger, G.N., Nielsen, D.C., Ma, L., and Ahuja, L.R. 2007, Comparison of modeling approaches to quantify residue architecture effects on soil temperature and water. International Journal of Soil and Tillage Research.95:84-96.
Rzwqm Simulation of Long-Term Crop Production, Water and Nitrogen Balances in Northeast Iowa Reprint Icon - (Peer Reviewed Journal)
Ma, L., Malone, R.W., Heilman, P., Karlen, D.L., Kanwar, R., Cambardella, C.A., Ahuja, L.R. 2007. RZWQM simulation of long-term crop production, water and nitrogen balances in northeast Iowa. Geoderma 140(3):247-259. doi: 10.1016/j.geoderma.2007.04.009.
Simulating Management Effects on Crop Production, Tile Drainage, and Water Quality Using Rzwqm-Dssat Reprint Icon - (Peer Reviewed Journal)
Anapalli, S., Ma, L., Malone, R.W., Heilman, P., Ahuja, L.R., Kanwar, R., Karlen, D.L., Hoogenboom, G. 2007. Simulating management effects on crop production, tile drainage, and water quality using RZWQM-DSSAT. Geoderma 140:3 (2007)297-309. Published on-line 5/23/2007. doi:10.1016/j.geoderma.2007.04.013.
Evaluation of Crop Water Stress Based On Soil Moisture, Evapotranspiration, and Canopy Temperature - (Abstract Only)
Yu, Q., Xu, S., Ma, L., Ahuja, L.R. 2006. Evaluation of Crop Water Stress Based On Soil Moisture, Evapotranspiration, and Canopy Temperature. ASA-CSSA-SSSA Annual Meeting Abstracts. Indianapolis, IN. November 13, 2006.
Simulations of Limited-Water Irrigation Management Options for Corn in Dryland Agriculture - (Abstract Only)
Saseendran, A., Ahuja, L.R., Ma, L., Nielsen, D.C., Dunn, G.H. 2006. Simulations of Limited-Water Irrigation Management Options for Corn in Dryland Agriculture. ASA-CSSA-SSSA Annual Meeting Abstracts. Indianapolis, IN. November 13, 2006.
Applications of Agricultural System Models in Assessing and Managing Contamination of the Soil-Water-Atmosphere Continuum in Agriculture - (Proceedings)
Ahuja, L.R., Ma, L., Saseendran, A., Malone, R.W. 2006. Applications of agricultural system models in assessing and managing contamination of the soil-water-atmosphere continuum in agriculture. International Symposium for the Agricultural Environment. International Symposium for the Agricultural Environment.
Soil Organic Carbon Pool Changes under Long-Term No-Till and Cropping Intensity Regimes Across An Evapotranspiration Gradient in Eastern Colorado, Usa - (Abstract Only)
Ma, L., Sherrod, L.A., Peterson, G., Hansen, N., Ahuja, L.R. 2006. Soil organic carbon pool changes under long-term no-till and cropping intensity regimes across an evapotranspiration gradient in Eastern Colorado, USA. International Soil Tillage Research Organization Proceedings. KIel, Germany. 8/28 - 9/3/2006. (Abstract)
Modeling Effects of Till/no-Till and Surface Crop Residues on Soil Water, Temperature and Energy Balance - (Abstract Only)
Ahuja, L.R., Anapalli, S.S., Ma, L., Kozak, J.A., Aiken, R.M., Flerchinger, G.N. 2006. Modeling effects of till/no-till and surface crop residues on soil water, temperature and energy balance. International Soil Tillage Research Organization. Kiel, Germany, August 28-September 3, 2006.
Rzwqm Simulated Effects of Crop Rotation, Tillage, and Controlled Drainage on Crop Yield and Nitrate-N Loss in Drain Flow. Reprint Icon - (Peer Reviewed Journal)
Ma, L., Malone, R.W., Heilman, P., Jaynes, D.B., Ahuja, L.R., Saseendran, S.A., Kanwar, R.S., Ascough II, J.C. 2007. RZWQM simulated effects of crop rotation, tillage, and controlled drainage on crop yield and nitrate-n loss in drain flow. Geoderma 140(3):260-271. doi:10/1016/j/geoderma.2007.04.010.
Sensitivity of Tile Drainage Flow and Crop Yield on Measured and Calibrated Soil Hydraulic Properties Reprint Icon - (Peer Reviewed Journal)
Ma, L., Malone, R.W., Heilman, P., Ahuja, L.R., Meade, T.G., Anapalli, S.S., Ascough Ii, J.C., Kanwar, R.S. 2007. Sensitivity of tile drainage flow and crop yield on measured and calibrated soil hydraulic properties. Geoderma 140:3(2007) 284-296. Published on-line 5/16/2007. doi:10.1016/j.geoderma.2007.04.012
Decision Support for Nitrogen Management in Tile-Drained Agriculture 1825 Reprint Icon - (Proceedings)
Heilman, P., Malone, R.W., Ma, L., Hatfield, J.L., Ahuja, L.R., Ayen, J., Boyle, K., Kanwar, R. 2006. Decision support for nitrogen management in tile-drained agriculture. In: Voinov, A., Jakeman, A.J., Rizzoli, A.E. (eds). Proceedings of the iEMSs Third Biennial Meeting: "Summit on Environmental Modelling and Software". International Environmental Modelling and Software Society, Burlington, USA, July 2006. CD ROM.
Application of Agricultural System Models in Assessing and Managing Contamination of Soil-Water-Atmosphere Continuum in Agriculture - (Abstract Only)
Ahuja, L.R., Ma, L., Anapalli, S., Malone, R.W. 2006. Application of Agricultural System Models in Assessing and Managing Contamination of Soil-Water-Atmosphere Continuum in Agriculture. International Symposium for the Agricultural Environment. Ghent, Belgium. September 4-6, 2006. (Abstract).
Empirical Modeling of Nitrate Loading and Crop Yield for Corn-Soybean Rotations in Iowa - (Abstract Only) - (11-May-06)
Evaluating Various Water Stress Calculations in RZWQM and RZ-SHAW for Corn and Soybean Production Reprint Icon - (Peer Reviewed Journal)
Kozak, J.A., Ma, L., Ahuja, L.R., Flerchinger, G.N., Nielsen, D.C. 2006. Evaluating Various Water Stress Calculations in RZWQM and RZ-SHAW for Corn and Soybean Production. Agronomy Journal 98:1146-1155.
Decision Support for Nitrogen Management in Tile Drained Agriculture 1811 Reprint Icon - (Proceedings)
Heilman, P., Malone, R.W., Ma, L., Hatfield, J.L., Ahuja, L.R., Ayen, J., Boyle, K., Kanwar, R. 2006. Decision support for nitrogen management in tile drained agriculture. In: Jakeman, A., Rizzoli, A. (eds). Proceedings of the IEMSs Third Biennial Meeting: "Summit on Environmental Modelling and Software". International Environmental Modelling and Software Society, Burlington, USA, July 2006. CD ROM.
An Improved Agricultural System Model for Space-Time Simulation of Agricultural Landscape Variability - (Abstract Only)
Ascough II, J.C., Ma, L., Green, T.R., Flerchinger, G.N., Mcmaster, G.S., Ahuja, L.R., Vandenberg, B.C. 2006. An improved agricultural system model for space-time simulation of agricultural landscape variability. World Congress of Soil Science. July 9-15,2006.
Applications of Rzwqm in Agricultural Research for Soil and Water Management - (Abstract Only)
Ma, L., Ahuja, L.R., Saseendran, S.A. 2006. Applications of rzwqm in agricultural research for soil and water management. World Congress of Soil Science. Philadelphia, PA. 7/09/-7/14/2006.(Abstract).
Key Criteria and Selection of Sensitivity Analysis Methods Applied to Natural Resource Models Reprint Icon - (Proceedings)
Ascough Ii, J.C., Green, T.R., Ma, L., Ahuja, L.R. 2005. Key criteria and selection of sensitivity analysis methods applied to natural resource models. Modsim 2005 International Congress on Modeling and Simulation, Modeling and Simulation Society of Australia and New Zealand, Melbourne, Australia. December 12-15, 2005. p2463-2469.
Key Criteria and Selection of Sensitivity Analysis Methods Applied to Natural Resource Models Reprint Icon - (Proceedings)
Ascough Ii, J.C., Green, T.R., Ma, L., Ahuja, L.R. 2005. Key criteria and selection of sensitivity analysis methods applied to natural resource models. International Congress on Modeling and Simulation Proceedings. Salt Lake City, UT, November 6-11,2005.
Modelling Crop Canopy and Residue Rainfall Interception Effects on Soil Hydrological Components for Semi-Arid Agriculture - (Peer Reviewed Journal)
Kozak, J.A., Ahuja, L.R., Green, T.R., Ma, L. 2007. Modelling Crop Canopy and Residue Rainfall Interception Effects on Soil Hydrological Components for Semi-Arid Agriculture. Hydrological Processes. 21:229-241. Can be accessed at doi: 10.1002/hyp.6235.
Crop Canopy and Residue Rainfall Interception Effects on Water and Crop Growth - (Peer Reviewed Journal) - (01-Nov-05)
Modeling a Wheat-Maize Double Cropping System in China Using Two Plant Growth Modules with Rzwqm - (Peer Reviewed Journal)
Yu, Q., Saseendran, S.A., Ma, L., Flerchinger, G.N., Green, T.R., Ahuja, L.R. 2006. Modeling a wheat-maize double cropping system in china using two plant growth modules with rzwqm. Agricultural Systems. 89(2-3):457-477.2006.
Evaluating Nitrogen and Water Management of a Double Cropping System in China - (Peer Reviewed Journal)
Hu, C., Saseendran, S.A., Green, T.R., Ma, L., Li, X., Ahuja, L.R. 2006. Evaluating nitrogen and water management of a double cropping system in china. Vadose Zone Journal. 5:493-505.2006.
Trans-Disciplianry Soil Physics Research Critical to Synthesis and Modeling of Agricultural Systems Reprint Icon - (Peer Reviewed Journal)
Ahuja, L.R., Ma, L., Timlin, D.J. 2006. Trans-disciplianry soil physics research critical to synthesis and modeling of agricultural systems. Soil Science Society of America Journal.70:311-326.2006.
Field Scale Water Quality Management in the Us: State of the Art 2005 1814 - (Abstract Only)
Heilman, P., Ma, L., Malone, R.W. 2005. Field scale water quality management in the us: state of the art 2005. American Water Resources Association Summer Specialty Conference, Institutions for Sustainable Watershed Management: Reconciling Physical and Management Ecology in the Asia-Pacific, Honolulu, Hawaii, June 29, 2005.
Energy Balance and Water and Heat Transfer Simulated by Shaw and Rz-Shaw - (Abstract Only)
Yu, Q., Kozak, J.A., Xu, S., Flerchinger, G.N., Ma, L., Ahuja, L.R. 2005. Energy balance and water and heat transfer simulated by shaw and rz-shaw. ASA-CSSA-SSSA Annual 2005 Meeting Abstracts. Salt Lake City, UT. Nov. 6-10, 2005.
Spatial Water Quality Modeling Framework Development Using Arcgis9 - (Proceedings)
Ascough II, J.C., Green, T.R., Ahuja, L.R., Ma, L., Vandenberg, B.C. 2005. Spatial water quality modeling framework development using ArcGIS9. Proceedings 05-2082. 2005 ASAE Annual International Meeting, Tampa, FL. July 17-20. http://asae/frymulti.com/techpapers.asp?confid=tfl2005.
A New Soil C/n Module to Simulate Denitrification for Groundwater Remediation - (Abstract Only)
Ma, L., Hunter, W.J., Ahuja, L.R. 2005. A new soil C/N module to simulate denitrification for groundwater remediation. ASA-CSSA-SSSA Annual Meeting Abstracts. Nov. 6-10, 2005. Salt Lake City, UT.
Modeling Impacts of Crop Rotations, Tillage and N Management on Crop Productivity and Water Quality Using the Rzwqm-Dssat Hybrid Model - (Abstract Only)
Anapalli, S.S., Ma, L., Malone, R.W., Heilman, P., Ahuja, L.R., Kanwar, R.S., Meade, T.G. 2005. Modeling impacts of crop rotations, tillage and N management on crop productivity and water quality using the RZWQM-DSSAT hybrid model. ASA-CSSA-SSSA Annual Meeting, Salt Lake City, UT. Nov. 6-10, 2005.
Development and Evaluation of the Rzwqm-Cropgro Hybrid Model for Soybean Production - (Peer Reviewed Journal)
Ma, L., Hoogenboom, G., Ahuja, L.R., Nielsen, D.C., Ascough II, J.C. 2005.Development and evaluation of the RZWQM-CROPGRO hybrid model for soybean production. Agronomy Journal. 97:1172-1182.
Effectiveness of Rzwqm for Simulating Alternative Great Plains Cropping Systems - (Peer Reviewed Journal)
Saseendran, S.A., Nielsen, D.C., Ma, L., Ahuja, L.R., Vigil, M.F., Benjamin, J.G., Halvorson, A.D. 2005. Effectiveness of RZWQM for simulating alternative Great Plains cropping systems. Agronomy Journal 97:1183-1193.
Effectiveness of Rzwqm for Simulating Alternative Great Plains Cropping Systems - (Proceedings)
Anapalli, S.A., Nielsen, D.C., Ma, L., Ahuja, L.R., Vigil, M.F., Benjamin, J.G., Halvorson, A.D. 2005. Effectiveness of RZWQM for simulating alternative great plains cropping systems. Proceedings from the 35th Biological Systems Simulation Conference. April 19-21, 2005. Phoenix, AZ. P. 37-38.
Nitrate Losses in Subsurface Tile Drainage As Affected by Tillage, Crop Rotations, and Fertilizer Management - (Abstract Only)
Ma, L., Malone, R.W., Saseendran, S.A., Ahuja, L.R., Heilman, P., Kanwar, R.S. 2006. Nitrate losses in subsurface tile drainage as affected by tillage, crop rotations, and fertilizer management. Biological Systems Simulation Group Proceedings. Fort Collins, CO. April 11-13, 2006.
Development and Evaluation of the Rzwqm-Ceres-Maize Hybrid Model for Maize Production - (Peer Reviewed Journal)
Ma, L., Hoogenboom, G., Ahuja, L.R., Ascough Ii, J.C., Saseendran, S.A. 2006. Evaluation of the rzwqm-ceres-maize hybrid model for maize production. Agricultural Systems. 87(3): 274-295.
Assessment of Groundwater Use by Wheat (Triticum Acestivum L.) in the Luancheng Xian Region and Potential Implications for Water Conservation in the Northwestern North China Plain - (Peer Reviewed Journal)
Chunsheng, H., Delgado, J.A., Xiying, Z., Ma, L. 2005. Assessment of groundwater use by wheat (triticum acestivum l.) in the luancheng xian region and potential implications for water conservation in the northwestern north china plain. Journal of Soil and Water Conservation. 60:80-88.
Scaling and Estimation of Evaporation and Transpiration of Water Across Soil Textures - (Peer Reviewed Journal)
Kozak, J.A., Ahuja, L.R., Ma, L., Green, T.R. 2005. Scaling and estimation of evaporation and transpiration of water across soil textures. Vadose Zone Journal. 4:418-427. 2005.
Modeling Spatial Variability in Agriculture: the Agsimsgis Water Quality Tool - (Abstract Only)
Ascough Ii, J.C., Green, T.R., Ahuja, L.R., Vandenberg, B.C., Ma, L. 2004. Modeling spatial variability in agriculture: the agsimsgis water quality tool. Meeting Abstract. ESRI Southwest Users Group 2004 conference, Telleride, CO, October 20-22, 2004. www.swuggis.org/swug_2004/abstracts.shtml.
Practical Application of Sensitivity and Uncertainty Analysis Techniques: Lessons Learned with Two Agricultural System Models - (Abstract Only)
Ascough Ii, J.C., Ma, L. 2004. Practical application of sensitivity and uncertainty analysis techniques: lessons learned with two agricultural system models. Meeting Abstract. www.asa-cssa-ssa.org/anmeet. Seattle, WA. Oct.31-11/4/2004.
Practical Application of Sensitivity and Uncertainty Analysis Techniques: Lessons Learned with Two Agricultural System Models - (Abstract Only)
Ascough Ii, J.C., Ma, L. 2004. Practical application of sensitivity and uncertainty analysis techniques: lessons learned with two agricultural system models. ASA-CSSA-SSSA Annual Meeting Abstracts. Oct. 31 - Nov. 4 2004.
Simulating Planting Date Effects on Corn Production Using Rzwqm and Ceres-Maize - (Peer Reviewed Journal)
Saseendran, S.A., Ma, L., Nielsen, D.C., Vigil, M.F., Ahuja, L.R. 2005. Simulating planting date effects on corn production using RZWQM and CERES-Maize Models. Agronomy Journal. 97:58-71 (2005).
Predicting Pesticide Transport in Mulch Amended Soils: a Two-Compartment Model - (Peer Reviewed Journal)
Ma, L., Selim, H.M. 2005. Predicting pesticide transport in mulch amended soils: a two-compartment model. Soil Science Society of America Journal. 69:318-327. 2005.
Model Parameters for Agricultural Systems with Nonlinear Process Interations and Spatial Variability - (Abstract Only)
Green, T.R., Ahuja, L.R., Ascough II, J.C., Ma, L., Erskine, R.H., McMaster, G.S. 2004. Model parameters for agricultural systems with nonlinear process interations and spatial variability. Agronomy Abstracts a04-5627. (CD-ROM). 2004.
A Graphical Tool for Water Quality Conservation Planning 1718 - (Proceedings)
Heilman, P., Armendariz, G.A., Ma, L., Malone, R.W. 2004. A graphical tool for water quality conservation planning. Proc. 13th Internat'l. Soil Conservation Org. Conf., Conserving Soil and Water for Soc.: Sharing Solutions, July 2004, Brisbane, Australia, 6 p.
Role of Macropores in Pesticide Transport to Groundwater - (Proceedings)
Malone, R.W., Shipitalo, M.J., Ma, L., Ahuja, L.R., Rojas, K.W., Logsdon, S.D., Weatherington-Rice, J. 2004. Role of macropores in pesticide transport to groundwater. International Workshop on Applications, Enhancements, and Collaborations of ARS RZWQM and GPFARM Models. p. 39-40.
Agricultural Management Effects on Crop Production and N Losses to Tile Drainage in the Nashua Study: Simulation Results with Rzwqm - (Abstract Only)
Ma, L., Malone, R.W., Heilman, P., Anapalli, S., Ahuja, L.R., Kanwar, R.S. 2004. Agricultural management effects on crop production and n losses to tile drainage in the nashua study: simulation results with rzwqm. International Workshop on applications, enhancements and collaborations of ARS RZWQM and GPFARM. April 20-22, 2004. Fort Collins. pp. 14-15.
Using Rzwqm to Simulate Water, Nitrogen, and Planting Date Effects on Corn, Soybean, and Winter Wheat Production in Northeast Colorado - (Proceedings)
Nielsen, D.C., Ma, L., Anapalli, S., Ahuja, L.R. 2004. Using RZWQM to simulate water, nitrogen, and planting date effects on corn, soybean, and winter wheat production in Northeast Colorado. International Workshop on Application, Enhancements and Collaborations of ARS RZQWM Models, Fort Collins, CO, April 20-22, 2004. p. 24-25.
Agricultural System Models in Field Research and Technology Transfer - (Proceedings)
Ahuja, L.R., Ma, L., Andales, A.A., Saseendran, S.A. 2004. Agricultural system models in field research and technology transfer. Second International Agronomy Congress Proceedings. Punjab Singh, I.P.S. Ahlawat and R.C. Gautam (eds.) Indian Society of Agronomy. pp. 226-233.
Modeling Alternative Cropping Systems for Central Great Plains Using Rzwqm - (Proceedings)
Anapalli, S.S., Nielsen, D.C., Ma, L., Ahuja, L.R., Vigil, M.F., Benjamin, J.G. 2004. Modeling alternative cropping systems for central great plains using RZWQM. Proceedings of the International Workshop on Applications, Enhancements and Collaborations of ARS RZWQM and GPFARM Models. April 20-22, 2004. p.22-23.
Model Parameterization at Different Scales: How Do We Estimate and Incorporate Spatial Information? - (Abstract Only)
Green, T.R., Ascough Ii, J.C., Ahuja, L.R., Ma, L., Erskine, R.H. 2004. Model parameterization at different scales: how do we estimate and incorporate spatial information?. Intl. Workshop on Applications, Enhancements and Collaboration of ARS RZWQM and GPFARM Models, April 20-22, 2004, Fort Collins, CO.
The Future of Spatial Modeling at Gpsru - (Abstract Only)
Ascough Ii, J.C., Green, T.R., Ahuja, L.R., Mcmaster, G.S., Ma, L. 2004. The future of spatial modeling at GPSRU. Workshop Proceedings. Intl. Workshop on Applications, Enhancements, and Collaboration of ARS RZWQM and GPSFARM Models, April 20 - 22, 2004, Fort Collins, CO.
Space-Time Modeling of Agricultural Landscape Variability Using Agsimgis - (Proceedings)
Ascough Ii, J.C., Green, T.R., Cipra, J.E., Ahuja, L.R., Ma, L. 2004. Space-time modeling of agricultural landscape variability using agsimgis. Annual Hydrology Days Conference Proceedings. March 10-12, 2004. Fort Collins, CO. pp. 10-21.
Book Review: Mathematical Modeling for System Analysis in Agricultural Research by Karel D. Vohnout - (Literature Review)
Ma, L., Ahuja, L.R. 2004. Book review: mathematical modeling for system analysis in agricultural research by karel d. vohnout. Agricultural Systems. Vol 81, pp. 273-274.
Using Rzwqm to Predict Herbicide Leaching Losses in Subsurface Drainage Water - (Peer Reviewed Journal)
Bakhsh, A., Ma, L., Ahuja, L.R., Hatfield, J.L., Kanwar, R.S. 2004. Using rzwqm to predict herbicide leaching losses in subsurface drainage water. Agricultural Systems. Vol 47(5):1415-1426. 2004.
Simulating Swine Manure Effects on N Leaching and Crop Production - (Abstract Only)
MA, L., MALONE, R.W., ANAPALLI, S.A., MEADE, T.G., KANWAR, R.S., KARLEN, D.L., HATFIELD, J.L., AHUJA, L.R. SIMULATING SWINE MANURE EFFECTS ON N LEACHING AND CROP PRODUCTION. CD-ROM. MADISON, WI. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2003.
Simulating Late Spring Nitrogen Test Effects on N Leaching and Crop Production - (Abstract Only)
MALONE, R.W., MEADE, T.G., MA, L., ANAPALLI, S.A., KANWAR, R.S., KARLEN, D.L., HATFIELD, J.L., AHUJA, L.R. SIMULATING LATE SPRING NITROGEN TEST EFFECTS ON N LEACHING AND CROP PRODUCTION. CD-ROM. MADISON, WI. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2003.
Test of the Root Zone Water Quality Model (Rzwqm) for Predicting Runoff of Atrazine, Alachlor and Fenamiphos Species from Conventional-Tillage Corn Mesoplots - (Peer Reviewed Journal)
Ma, Q.L., Wauchope, R.D., Ma, L., Rojas, K.W., Malone, R.W., Ahuja, L.R. 2004. Test of the root zone water quality model (rzwqm) for predicting runoff of atrazine, alachlor and fenamiphos species from conventional-tillage corn mesoplots. Pest Management Science 60:267-276(2004).
Application of the Root Zone Water Quality Model (Rzwqm) to Pesticide Fate and Transport: An Overview - (Peer Reviewed Journal)
Malone, R.W., Ahuja, L.R., Ma, L., Wauchope, R.D., Rojas, K.W., Ma, Q. 2004. A review of the root zone water quality model (RZWQM). Pest Management Science. 60:205-221.
Herbicide Leaching As Affected by Macropore Flow and Within-Storm Rainfall Intensity Variation: a Rzwqm Simulation - (Peer Reviewed Journal)
Malone, R.W., Weatherington-Ric, J., Shipitalo, M.J., Fausey, N.R., Ma, L., Ahuja, L.R., Wauchope, R.D., Ma, Q. 2004. Herbicide leaching as affected by macropore flow and within-storm rainfall intensity variation: a RZWQM simulation. Pest Management Science. 60:277-285.
Modeling Hydrology, Metribuzin Degradation, and Metribuzin Transport in Macroporous Tilled and No-Till Silt Loam Soil Using Rzwqm - (Peer Reviewed Journal)
Malone, R.W., Ma, L., Wauchope, R.D., Ahuja, L.R., Rojas, K.W., Ma, Q., Warner, R., Byers, M. 2004. Modeling hydrology, metribuzin degradation, and metribuzin transport in macroporous tilled and no-till silt loam soil using RZWQM. Pest Management Science. 60:253-266.
Simulating Nitrate Drainage Losses from a Walnut Creek Watershed Field - (Peer Reviewed Journal)
Bakhsh, A., Hatfield, J.L., Kanwar, R.S., Ma, L., Ahuja, L.R. 2004. Simulating nitrate losses from walnut creek watershed. Journal of Environmental Quality. 33(1)114-123.
Book Review: Crop-Soil Simulation Models: Applications in Developing Countries - (Literature Review)
Saseendran, S.A., Ahuja, L.R., Ma, L. 2003. Book review: crop-soil simulation models: applications in developing countries. Journal of Environmental Quality. Vol 32, pp. 2445-2446.
Modeling Nitrogen Management Effects on Winter Wheat Production Using Rzwqm and Ceres-Wheat - (Peer Reviewed Journal)
Saseendran, S.A., Nielsen, D.C., Ma, L., Ahuja, L.R., Halvorson, A.D. 2003. Modeling nitrogen management effects on winter wheat production using RZWQM and CERES-Wheat. Agronomy Journal 96:615-630.
Tillage Effect on Macroporosity and Herbicide Transport in Percolate - (Peer Reviewed Journal)
MALONE, R.W., LOGSDON, S.D., SHIPITALO, M.J., WEATERINGTON-RICE, J., AHUJA, L.R., MA, L. TILLAGE EFFECT ON MACROPOROSITY AND HERBICIDE TRANSPORT IN PERCOLATE. GEODERMA. 2003. v. 116. p. 191-215.
Evaluation of Rzwqm under Varying Irrigation Levels in Eastern Colorado - (Peer Reviewed Journal)
MA, L., NIELSEN, D.C., AHUJA, L.R., MALONE, R.W., ANAPALLI, S.S., ROJAS, K.W., HANSON, J.D., BENJAMIN, J.G. EVALUATION OF RZWQM UNDER VARYING IRRIGATION LEVELS IN EASTERN COLORADO. TRANSACTIONS OF THE AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS. 2002. v. 46. p. 39-49.
Predicting the Effects of Agricultural Management Practices on Subsurface Drainage: Nitrate - (Abstract Only)
MA, L., MALONE, R.W., AHUJA, L.R., KANWAR, R.S. PREDICTING THE EFFECTS OF AGRICULTURAL MANAGEMENT PRACTICES ON SUBSURFACE DRAINAGE: NITRATE. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2002. CD-ROM. MADISON, WI.
Predicting the Effects of Agricultural Management Practices on Subsurface Drainage: Tile Flow - (Abstract Only)
MALONE, R.W., MA, L., AHUJA, L.R., KANWAR, R.S. PREDICTING THE EFFECTS OF AGRICULTURAL MANAGEMENT PRACTICES ON SUBSURFACE DRAINAGE: TILE FLOW. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2002. CD-ROM. MADISON, WI.
Use of Limited Soil Property Data and Modeling to Estimate Root Zone Soil Water Content. - (Peer Reviewed Journal)
STARKS, P.J., HEATHMAN, G.C., AHUJA, L.R., MA, L. USE OF LIMITED SOIL PROPERTY DATA AND MODELING TO ESTIMATE ROOT ZONE SOIL WATER CONTENT.. JOURNAL OF HYDROLOGY. 2003. v. 272 p. 131-147.
Simulating Soybean Water Stress Effects with Rzwqm and Cropgro Models - (Peer Reviewed Journal)
NIELSEN, D.C., MA, L., AHUJA, L.R., HOOGENBOOM, G. SIMULATING SOYBEAN WATER STRESS EFFECTS WITH RZWQM AND CROPGRO MODELS. AGRONOMY JOURNAL. 2002. v. 94. p. 1234-1243.
Evaluation of Root Zone Water Quality Model for Simulation of Non-Point Source Polution from Agricultural Lands - (Proceedings) - (15-Jun-02)
Evaluation of Root Zone Water Quality Model for Simulation of Non-Point Source Polution from Agricultural Lands - (Proceedings) - (15-Jun-02)
Evaluation of Root Zone Water Quality Model for Simulation of Non-Point Source Polution from Agricultural Lands - (Proceedings) - (15-Jun-02)
Evaluation of Root Zone Water Quality Model for Simulation of Non-Point Source Polution from Agricultural Lands - (Proceedings) - (15-Jun-02)
How Good Is Good Enough? What Information Is Needed for Agricultural Water Quality Planning and How Can It Be Provided Most Affordably? 1348 - (Peer Reviewed Journal) - (15-Feb-02)
Adaptive grid refinement in numerical models for water flow and solute transport in soils: A review - (Peer Reviewed Journal)
Mansell, R.S., Ma, L., Ahuja, L.R., Bloom, S.A. 2002. Adaptive grid refinement in numerical models for water flow and solute transport in soils: A review. Vadose Zone Journal. 1:222-238.
Whole System Integration and Modeling: Essential to Agricultural Science and Technology in 21st Century - (Book / Chapter)
Ahuja, L.R., Ma, L., Howell, T.A. 2002. Whole system integration and modeling: essential to agricultural science and technology in 21st century. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. Lewis Publishers. April 2002. Chapter One, pp 1-7.
Whole System Integration and Modeling: Essential to Agricultural Science and Technology in 21st Century Reprint Icon - (Book / Chapter)
Ahuja, L.R., Ma, L., Howell, T.A. 2002. Whole system integration and modeling: essential to agricultural science and technology in 21st century. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. Lewis Publishers. April 2002. Chapter One, pp 1-7.
Whole System Integration and Modeling: Essential to Agricultural Science and Technology in 21st Century - (Book / Chapter)
Ahuja, L.R., Ma, L., Howell, T.A. 2002. Whole system integration and modeling: essential to agricultural science and technology in 21st century. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. Lewis Publishers. April 2002. Chapter One, pp 1-7.
Whole System Integration and Modeling: Essential to Agricultural Science and Technology in 21st Century Reprint Icon - (Book / Chapter)
Ahuja, L.R., Ma, L., Howell, T.A. 2002. Whole system integration and modeling: essential to agricultural science and technology in 21st century. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. Lewis Publishers. April 2002. Chapter One, pp 1-7.
Topographic Analysis, Scaling and Models to Evaluate Spatial/temporal Variability of Landscape Processes and Management - (Book / Chapter)
Ahuja, L.R., Green, T.R., Erskine, R.H., Ma, L., Ascough Ii, J.C., Dunn, G.H., Shaffer, M.J., Martinez, A. 2002. Topographic analysis, scaling and models to evaluate spatial/temporal variability of landscape processes and management. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. April 2002. Chapter 13, pp 265-272.
An Evaluation of Rzwqm, Cropgro, and Ceres-Maize for Response to Water Stress in the Central Great Plains - (Book / Chapter) - (03-Oct-01)
Simulating Nitrate Losses from Walnut Creek Watershed - (Proceedings) - (20-Sep-01)
Parameterization of Agricultural System Models: Current Approaches and Future Needs - (Book / Chapter) - (03-Sep-01)
Water Transport Modeling Using Rzwqm - (Proceedings) - (01-Aug-01)
Evaluation of Root Zone Water Quality Model for Simulation of Nonpoint Source Pollution from Agricultural Lands - (Proceedings)
BAKHSH, A., HATFIELD, J.L., KANWAR, R.S., MA, L., AHUJA, L.R. EVALUATION OF ROOT ZONE WATER QUALITY MODEL FOR SIMULATION OF NONPOINT SOURCE POLLUTION FROM AGRICULTURAL LANDS. ASAE ANNUAL INTERNATIONAL MEETING. 2001. CD-ROM. MADISON, WI.
Evaluation of the Root Zone Water Quality Model (Rzwqm) - (Book / Chapter) - (01-Jul-01)
Computer Models to Guide Soil Water Management for Plants - (Book / Chapter) - (25-Jun-01)
Agricultural System Models in Field Research and Technology Transfer - (Book / Chapter)
Ahuja, L.R., Ma, L., Howell, T.A. 2002. Agricultural system models in field research and technology transfer. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. 341 pp. 2002.
Agricultural System Models in Field Research and Technology Transfer - (Book / Chapter)
Ahuja, L.R., Ma, L., Howell, T.A. 2002. Agricultural system models in field research and technology transfer. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. 341 pp. 2002.
Agricultural System Models in Field Research and Technology Transfer - (Book / Chapter)
Ahuja, L.R., Ma, L., Howell, T.A. 2002. Agricultural system models in field research and technology transfer. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. 341 pp. 2002.
Agricultural System Models in Field Research and Technology Transfer - (Book / Chapter)
Ahuja, L.R., Ma, L., Howell, T.A. 2002. Agricultural system models in field research and technology transfer. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. 341 pp. 2002.
Macropore Component Assessment of the Root Zone Water Quality Model (Rzwqm)using No-Till Soil Blocks - (Peer Reviewed Journal) - (23-Mar-01)
Simulation of Water and Pesticide Movement Through Macropores Using the Root Zone Water Quality Model (Rzwqm) - (Abstract Only) - (09-May-00)
Quantifying Wheel-Track Effects on Soil Hydraulic Properties for Agricultural Systems Modeling - (Proceedings) - (31-Jan-00)
Assessment of the Macropore Component of Rzwqm - (Abstract Only) - (01-Nov-99)
Root Zone Water Quality Model Sensitivity Analysis Using Monte Carlo Simulation - (Peer Reviewed Journal) - (28-Oct-99)
Validation of the Root Zone Water Quality Model (Rzwqm): a Review - (Proceedings) - (18-Jul-99)
ARS News Articles
Last Modified: 8/27/2014
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