Phosphorus Release in Sodium Ion Dominated Soils
- Raj K. Gupta ,
- R. R. Singh and
- K. K. Tanji
Calcareous sodic soils having high sodicity and high pH often maintain high solution P concentration. The effect of high exchangeable Na, high pH, and alkali anions and carbonates on the release of inorganic P was investigated in soils representing the three major benchmark sodic soil series found in the Indo-Gangetic plains of India. Sodium saturation of the exchange complex, high pH, carbonate ions, and low electrolyte level shifted the solid P-solution P equilibrium in favor of maintenance of high P concentrations in aqueous solutions. In the sodic soil environment, release of P can be accounted for by the dissolution of various forms of Ca-P compounds at high alkalinity and pH. Cultivation of alkali soils improves the organically bound P forms. Together or in combination, high sodicity, high pH, and the presence of carbonate ions at low salinity markedly increased P desorption and P availability in sodic soils.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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