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Transport of Inorganic Phosphorus in an Alfisol¹

ABSTRACT

Adsorption, desorption, and movement of phosphorus in an Alfisol soil were characterized by miscible-displacement and batch-type experiments. The influence of pore-water velocity, aggregate size, and pretreatment of the soil with P was evaluated. A model which considers the interaction of P with soil as an equilibrium kinetic process was utilized to differentiate between instantaneous and time-dependent reactions which appear to govern the adsorption-desorption process during displacement.

Pore-water velocity has a greater influence on the adsorption rather than the desorption process which appeared to be more chemically controlled. Aggregate size affected the time-dependent more than the instantaneous processes of soil-P interaction. Instantaneous reactions between P and soil were shown to be mitigated by pretreatment of the soil with P in contrast to time-dependent reactions. A pore model was hypothesized to explain the differential uptake and release of P during displacement.

¹ Contribution from the Department of Land, Air and Water Resources, University of California, Davis, CA 95616. Senior author located — Instituto Agronomico, CP 28, 13100 — Campinas, Sao Paulo, Brazil.

² Former Graduate Research Associate, and Professors, respectively.

Received for publication October 3, 1978. Accepted for publication June 12, 1979.