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Nonlinear Analysis of Phosphorus Transport in Soils

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

Citation:  Paper number  033104,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.15010) @2003
Authors:   Amir P. Nejadhashemi, Aisha M. Sexton, Hubert J. Montas, Adel Shirmohammadi
Keywords:   Sorption Processes, Phase-Space Analysis, Finite Element Analysis, Modeling

The effects of sorption dynamics and hysteresis on phosphorus transport through saturated soils are investigated using an advective-dispersive transport model coupled with three sorption models: 1) Equilibrium Langmuir; 2) Dynamic Langmuir, and; 3) Hysteretic Dynamic Langmuir. Three transport scenarios are investigated: 1) a slug in a phosphorus free soil; 2) a slug in a phosphorus-laden soil, and; 3) a phosphorus-free slug in a phosphorus-laden soil. Results indicate that phosphorus does not move in phosphorus-free soils but can move significantly in phosphorusladen soils. Sorption dynamics have a significant effect on leaching but hysteresis has only a mild influence on transport. It is concluded that nonlinear sorption dynamics are important in subsurface transport of phosphorus and should be investigated further.

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