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Computer Modeling of Nitrogen Transformations in Soils¹

ABSTRACT

A nitrogen-transformation model was formulated for simultaneous computation of various N transformations: nitrification, denitrification, mineralization, immobilization, ion exchange, and plant uptake. These processes were assumed to obey first-order kinetics. Differential equations that describe the above processes are solved simultaneously by using the 4th-order Runge-Kutta method and the Adams-Bashforth-Moulton predictor-corrector equations. The computer model was tested against data reported from several incubation studies. This model could be linked to a transport model to predict the temporal and spatial distribution of various N species in soil profiles.

Key Words: nitrification • denitrification • mineralization • cation exchange

¹ Contribution from Dep. of Water Science and Engineering, University of California, Davis 95616. This work is being supported by NSF GI-34733XI and Kearney Foundation.

² Postgraduate Research Water Scientist and Lecturer in Water Science, respectively. Senior author is now Assistant Professor of Civil Engineering, Tehran Polytechnique, Tehran, Iran.

Received for publication December 21, 1973.