HomeInternational Rice Research Notesvol. 28 no. 1 (2003)

Effects of Organic and Inorganic P Fertilizers on Soil Fertility and Grain Yield in a Rice-Pulse System

D. Selvi | S. Mahimairaja | P. Santhy | B. Rajkanman

Discipline: Agriculture



The amount of indigenous rock phosphate (RP) deposit used in India was estimated to be about 260 t (Narayanasamy and Biswas 1998). It was equally effective as a water-soluble P fertilizer in suitable environments (Khasawnch and Doll 1986). Rock phosphate is applied more for its residual effect because its availability increases slowly and continuously when in contact with the soil. The relative effectiveness is two to three times more than that of superphosphate (Chien and Hammond 1988).