Abstract
A numerical model is described to simulate water and nitrogen transport and transformations under transient soil water flow conditions. The nitrogen transformation processes considered were nitrification, denitrification, immobilization, mineralization, and ionic exchange of ammonium. The model was evaluated using experimental data from a lysimetric study. Two sets of lysimeters were irrigated with sewage water, whereas, one set was irrigated with tubewell water. Each set had four lysimeters having depths of 1.2, 1.5, 1.8, and 2.0m. Soil and leachate samples were collected and analyzed at regular intervals for NH; -N and N03-N. Model predictions of NH4+-N and N03-N were in close agreement with the observed values except for 37th day observations for NH4+-N and II Oth day observations in case ofN03-N. To evaluate the model performance a paired t test and root mean square error (RMSE) methods were applied. The RMSE values ranged from 0.1 to 3.9 and 0.05 to 2.55 for the ammonium and nitrate distributions, respectively.
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