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32P TRACER STUDIES ON THE METHODS OF INCREASING THE EFFICIENCY OF CITRATE SOLUBLE AND INSOLUBLE PHOSPHATES FOR RICE ON ACID SOILS

Studies with 32P-tagged mono-, di-, or tricalcium phosphate (MCP, DCP, TCP) showed that on application to moist aerobic acid soils, a considerable proportion of the applied phosphates even from DCP and TCP were converted to Al-P and/or Fe-P due to gradual dissolution by the H+ ions of the system, resulting in increased Olsen or Bray P. Dry matter production of rice and utilization of applied P was found to be higher when the P carriers were applied to moist acid soils 2 weeks before flooding than when these were applied at flooding. The reasons for this differential response to time of application have been explained. There appears scope for making the citrate soluble and insoluble phosphates as efficident as water soluble phosphates for growing rice on acid soils by their application to the moist soil 2 weeks before flooding.