Effect of Liming, Superphosphate and Rock Phosphate Application to Rice on the Yield and Uptake of Nutrients on Acid Sulphate Soils

In a greenhouse experiment, lime and rock phosphate application increased grain and straw yield of rice. The response of rice to P was more as compared to lime. Phosphate application resulted in both increased P content and uptake but at each P level, application of lime further increased P content and uptake. Lime and P application considerably reduced the Al content of both grain and straw, Fe content increased with lime application but P had a depressing effect on Fe uptake. Mn content in grain and straw reduced following lime application in both the soils. However, P application increased Mn content without any definite trend.