applied, it will revert back to its less or insoluble fonn. Lack of P in the soil can be somewhat alleviated by applying fused magnesium phosphate (T7). Lack of available P in the soil would cause stunted growth, reduced tillering and reduction in the number of panicles. In the 2nd season, the available P was about 4 ppm (data not shown), and there was no significant difference between treatments. But the rice yield did not seem to be affected significantly by the possible lack of available P in the soils, as the yield in T6 and T7 had shown. The required soil available P for rice production is 7-20 ppm