Author
CLARK, J - South Dakota State University | |
FERNANDEZ, F - University Of Minnesota | |
Veum, Kristen | |
CAMBERATO, J - Purdue University | |
CARTER, P - Dupont Pioneer Hi-Bred | |
FERGUSON, R - University Of Nebraska | |
FRANZEN, D - North Dakota State University | |
Kitchen, Newell | |
LABOSKI, C.A. - University Of Wisconsin | |
NAFZIGER, E - University Of Illinois | |
SAWYER, J - Iowa State University | |
SHANAHAN, J - Fortigen |
Submitted to: Meeting Abstract
Publication Type: Abstract Only Publication Acceptance Date: 11/4/2018 Publication Date: 11/4/2018 Citation: Clark, J., Fernandez, F.G., Veum, K.S., Camberato, J.J., Carter, P.R., Ferguson, R.B., Franzen, D.W., Kitchen, N.R., Laboski, C.M., Nafziger, E.D., Sawyer, J.E., Shanahan, J. 2018. Estimating nitrogen fertilizer rate using mineralizable- and soil nitrate-nitrogen [abstract]. ASA-CSSA Meeting, November 4-7, 2018, Baltimore, Maryland. Paper 111701. Interpretive Summary: Technical Abstract: Estimating nitrogen (N) availability from mineralization of soil organic matter with the anaerobic potentially mineralizable N (PMNan) test alone or in conjunction with soil nitrate-N tests may improve N management guidelines for corn. This may increase corn grain yield and economic returns while reducing the chance of over-applying N fertilizers and the associated environmental degradation that occurs with N loss. Forty-nine corn N response field studies across eight US Midwestern states were soil sampled for PMNan and nitrate-N before planting and again in-season from fertilized and unfertilized areas. These soil-N measurements were used alone and in combination other mineral soil N tests to predict corn N needs. Soil and weather conditions influenced the effect of soil sampling timing, N fertilizer addition, and laboratory incubation length on PMNan. Separating sites by texture or temperature, deeper soil nitrate-N sampling depth, and including initial NH4+ from PMNan analysis improved N management. However, these improvements were not large enough (R2 = 0.41) to reliably use soil-N and PMNan alone to predict N needs of corn. |