Simulation Model for Soil Erosion-Productivity Relationships
1985
Shaffer, Marvin J.
A mathematical model is described that simulates the impact of soil erosion on the short and long-term productivity of soil. The model is known as the Nitrogen-Tillage-Residue Management (NTRM) model and has capabilities at the research level to simulate complex interactions of a growing crop such as corn (Zea mays L.) with climate inputs together with physical, chemical, and biological properties of the soil. Nitrogen-Tillage-Residue Management is intended to provide a means of evaluating existing and proposed soil management practices in the subject areas of erosion, soil fertility, tillage, crop residues, and irrigation. Illustration of model output, validation, and application is provided for three soils in the northern Corn Belt. These include a Fayette silt loam (Typic Hapludalf) (deep loess), a Dubuque silt loam (Typic Hapludalf) (shallow to bedrock), and a Dakota fine sandy loam (Typic Argiudoll) (shallow to coarse material). Corn growth and yield are simulated under noneroded and two levels of eroded conditions for a period of 100 yr. Management techniques, which include supplemental N, conservation tillage, and irrigation, are simulated on the eroded profiles to evaluate relative benefits and demonstrate the types of results produced by model sensitivity analyses.
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