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A Model for Nitrogen Transformations in Effluent Irrigated Soil Aggregates

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  023122,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.11232) @2002
Authors:   Arie Kremen, Uri Shavit, Jacob Bear, Avi Shaviv
Keywords:   Nitrogen Transformations, Soil Aggregates, Effluent Irrigation, Microsites, Numerical Simulation

A model has been developed to describe Nitrogen and organic Carbon transformations in soil aggregates. The proposed model extends previously published models of radial diffusion by considering the processes that lead up to the development of conditions suitable for denitrification to occur. In particular, the model considers the situation where the soil is irrigated with treated wastewater effluent. It is demonstrated how the model can be applied to perform sensitivity analyses of parameters that are known only with high uncertainty. Presented results illustrate the models capability to reproduce results from previous models with respect to the prediction of the anaerobic volumetric fraction. Nitrogen species fluxes from the aggregate are consistent with the kinetic model chosen; an incoherency in the determination of the denitrification parameters impede the results obtained form that sub-model and requires attention prior to the implementation of the aggregate model in a soil profile model.

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