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A Simulation Model of Biophysiochemical Transformations of Nitrogen in Tile-Drained Corn Belt Soil¹

ABSTRACT

A computer simulation model of nitrogen transformations and transport in soil in a Corn Belt field was developed to predict nitrate concentrations in tile effluent as a function of farm management practices and climatic conditions. Water flow in the unsaturated and saturated zones, evapotranspiration, and nitrogen flow due to mass flow, dispersion, and diffusion are simulated along with nitrogen transformations of mineralization, immobilization, nitrification, and denitrification. Growth of corn (Zea mays L.) and soybeans (Glycine max L.) is included. Predicted values of tile water flow, water table height, nitrate-nitrogen concentrations in the soil water profile and in the tile effluent compared favorably to measured values for a field for 1972; also, predictions of nitrate-nitrogen concentrations in tile effluent for 1970–71 agree well with actual data.

Key Words: nitrate • computer simulation • soybeans • evapotranspiration

¹ This work has been supported by the National Science Foundation under Project Numbers GI-29926 XI and GI-39009.

² Research Associate, Center for the Biol. of Natur. Syst. and Control Syst., Sci. and Eng. Dep., now with the Chem. Eng. Dep., The Univ. of Calgary, Calgary, Alberta, T2N 1N4, Canada; former Research Assistant, Center for the Biol. of Natur. Syst., Washington Univ.; Assistant Professor of Soil Physics in Agronomy, Univ. of Illinois, Urbana, IL 61801; Associate Professor of Electrical Engineering, Washington Univ., St. Louis, MO 63130; respectively.

Received for publication May 9, 1974.