Dr. Henry Allen Torbert
USDA-ARS Grassland, Soil, and Water Research Lab
808 East Blackland Road
Temple, TX 76502
The Torbert N Model is a computer simulation model designed to examine the interaction of nitrogen, carbon and water in small scale, plant-soil systems. It contains graphical user interfaces developed using Stella II on the Macintosh. This system is designed for three types of users: beginning students interested in learning about plant-soil interactions; intermediate students who want to explore the dynamics of state equations for plant-soil nitrogen interactions; and, researchers who wish to modify the existing state equations in order to test new hypotheses (Torbert, et al.).
The Torbert N Model contains several modules: fertilizer application, growing crop, atmospheric-N, soil organic matter and a groundwater N-input module. The model does require the user to provide input data values for soil N content (or fertilizer input), weather (temperature and rainfall), planting day, expected yield of corn and soil type. The weather generator component contains the Richardson weather simulator for crop management (WGEN) also discussed in this report.
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