Application of phosphorus to rice through rock phosphates singly or in combination with lime proved beneficial for increasing yield of rice on an Oxisol (acidic). These sources also maintained higher available phosphate status of the soil during the crop growth than with superphosphate; which was reflected in increased P uptake. P use efficiency the total net returns and cost-benefit ratio. It will pay to use rock phosphates on an acidic soil relatively at higher rates with lime at the lime requirement value for managing the productivity of these coastal acid soils.
Rock phosphate, liming, lime requirement, uptake, P use efficiency, net returns and cost benefit ratio
