Click on “Download PDF” for the PDF version or on the title for the HTML version.


If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Nonlinear Analysis of Phosphorus Transport in Soils

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

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.

(Download PDF)    (Export to EndNotes)