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Title: 2DSPUD, A TWO-DIMENSIONAL MODEL OF POTATO GROWTH AND DEVELOPMENT.

Author
item Timlin, Dennis
item Kim, Soo Hyung
item Pachepsky, Yakov
item Reddy, Vangimalla
item FRAISSE, CLYDE - WASHINGTON STATE UNIV
item Alva, Ashok
item Baker, Jeffrey

Submitted to: Integrated Biological Systems Conference
Publication Type: Abstract Only
Publication Acceptance Date: 4/19/2003
Publication Date: 4/14/2003
Citation: Timlin, D.J., Kim, S., Pachepsky, Y.A., Reddy, V., Fraisse, C., Alva, A.K., Baker, J.T. 2003. 2dspud, a two-dimensional model of potato growth and development.[abstract]. Integrated Biological Systems Conference. P. 63.

Interpretive Summary:

Technical Abstract: Potato is an intensively managed crop that requires large amounts of nutrients and water. Potato is also planted on hills or ridges which imposes a strong two-dimensional structure to infiltration and runoff. Our goal is to develop a mechanistic simulator of potato growth and development that is coupled with comprehensive two dimensional models of soil and atmospheric processes. The model calculates two-dimensional fluxes of water and movement of chemicals between rows and within the soil profile to simulate row position effects. The purpose of the model is to provide information on crop development stage, irrigation timing and amount, nitrogen fertilizer requirements and timing, and expected time to harvest. The plant model was developed from SIMPOTATO with more detail in the photosynthetic component. In order to simulate photosynthesis on a more mechanistic level, we added a coupled, leaf level model of photosynthesis, stomatal conductance, and transpiration (Kim, 2001). The soil processes are simulated by 2DSOIL, a modular water and solute transport model that was adapted from SWMS_2D, SOIL-N and GLYCIM. 2DSOIL is a two dimensional model using a finite element description of solute and water flow. Results on phenology and photosynthesis are shown. Canopy level photosynthesis measurements from the Alternate Crops and Systems Laboratory's SPAR (Soil Plant Atmosphere Research) chambers were used to evaluate the performance of the photosynthesis model. Simulated photosynthesis values did follow the measured data at the extremes of the temperature ranges. However, uncertainties in leaf age and canopy light interception were sources of error.