SIMULATED TRANSFORMATIONS AND TRANSPORT OF PHOSPHORUS IN SOIL

Publisher Website
Google Scholar
Abstract
A mechanistic multistep model was developed using chemical kinetics and mass transport theory to describe transformations and movement of orthophosphate in soil. Soil P was assumed to occur simultaneously in any of 4 primary phases: water-soluble, physically adsorbed, immobilized (or chemisorbed) and precipitated. The kinetics of reactions which control the transformation of P between any 2 of the 4 phases were considered to be reversible and of the Nth order. A range of values for the reaction rate coefficients were used in the model to describe the transport of applied P in the solution phase during steady water flow through a soil initially devoid of P.