CHANGES IN THE AVAILABILITY OF PHOSPHORUS IN IRRIGATED RICE SOILS

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Abstract
Analyses of rice soils irrigated under field conditions showed that continued irrigation made the surface soil in the Arkansas rice area decidedly more alkaline than the subsoil. This resulted from the addition of large amounts of soluble Ca in the water. Available phosphorus studies showed that irrigation caused a reduction in the amount of water-soluble in-organic P in rice soil. The reduction was caused either by reversion of the soluble phosphate or by conversion to organic forms of P as the result of biological activities under anaerobic conditions.

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