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SIMULATION OF NITROGEN MOVEMENT, TRANSFORMATION, AND UPTAKE IN PLANT ROOT ZONE
Citation:
Davidson, J., D. Graetz, P. Rao, AND H. Selim. SIMULATION OF NITROGEN MOVEMENT, TRANSFORMATION, AND UPTAKE IN PLANT ROOT ZONE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-78/029 (NTIS PB280712), 1978.
Description:
A detailed research model and a conceptual management model were developed to describe the fate of nitrogen in the plant root zone. Processes considered in both models were one-dimensional transport of water and water-soluble N-species as a result of irrigation/rainfall events, equilibrium absorption-desorption, microbiological N-transformations, and uptake of water and nitrogen species by a growing crop. The research model was based on finite-difference approximations (explicit-implicit) of the partial differential equations describing one-dimensional water flow and convective-dispersive NH4 and NO3 transport along with simultaneous plant uptake and microbiological N-transformations. Ion-exchange (absorption-desorption) of NH4 was also considered. The micro-biological transformations incorporated into the model describe nitrification, denitrification, mineralization and immobilization.