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Using Phosphorus Concentration in the Soil Solution to Predict Phosphorus Desorption to Water

^a Departamento de Ciencias y Recursos Agrícolas y Forestales, Universidad de Córdoba, Apdo. 3048, 14080 Córdoba, Spain
^b Departamento de Ciencias Agroforestales, Universidad de Sevilla, EUITA, Ctra. Utrera km 1, 41013 Sevilla, Spain

View larger version (15K): [in a new window]   Fig. 1. Phosphorus sorption and desorption curves (positive and negative branches, respectively, of the y axis) of a hypothetical soil conforming Freundlich equations with b = 0.4. The amount of total desorbable P for an initial dissolved reactive phosphorus (DRP) in the soil solution of 2 mg L-1 was one-half the amount of sorbed P.

View larger version (20K): [in a new window]   Fig. 2. Logarithmic plot of the amount of desorbed P as a function of the solution to soil ratio (W) for two hypothetical soils exhibiting Freundlich desorption curves with the stated kA values and b = 0.5. The initial dissolved reactive phosphorus (DRP) concentration in the soil solution was c0 = 2 mg L-1 in both cases.

View larger version (23K): [in a new window]   Fig. 3. Logarithmic plot of the amount of desorbed P, at selected values of W, as a function of the initial dissolved reactive phosphorus (DRP) concentration in the soil solution for a population of hypothetical soils exhibiting identical P desorption curves (A = 500 mg kg-1, k = 0.5, and b = 0.5) but differing in solution DRP.

View larger version (25K): [in a new window]   Fig. 4. Logarithmic plot of the amount of P desorbed under near-static conditions at different times and W values as a function of the dissolved reactive phosphorus (DRP) concentration in the solution of 12 European soils. The slopes corresponding to the regression lines for each time and W value are shown as insets.

View larger version (24K): [in a new window]   Fig. 5. Logarithmic plot of the amount of P desorbed under turbulent conditions at different times and W values as a function of the dissolved reactive phosphorus (DRP) concentration in the solution of 12 European soils. The slopes corresponding to the regression lines for each time and W value are shown as insets.