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

José Torrent*,a and Antonio Delgadob

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



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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.

 


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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.

 


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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.

 


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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.

 


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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.

 





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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education
Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2001 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.