تلخیص
Various phosphorus (P) sources were compared to evaluate the efficient and economical P source for crop production under alkaline soil conditions. A field experiment was conducted having soil characteristics texture, sandy clay loam; pH, 7.7; ECe, 1.1 dS m"1 ; N, 0.07%; available P2O5 9.2 mg kg 1 ; and K2O, 115 mg kg"1 . For this purpose P was applied to rice crop @ 30,60,90 kg P2O5 ha 1 as single superphate (SSP); 60,90 kg P2O5 ha 1 as bone meal (BM) and 180, 270 kg P2O5 ha"1 as rock phosphate (RP). The residual effect of these treatments on the following berseem fodder crop was also worked out. In rice crop SSP was superior to other sources with respect to yield and yield contributing factors like plant height, tillers and panicles count hill"1 , number of grains panicle"1 and 1000-grain weight. The best P rate was 90 kg P2O5 ha"1 as SSP. Rock phosphate produced the lowest crop yield as compared to SSP and BM. The residual effect of these P sources on the following berseem fodder crop was similar to rice crop. The low efficiency of RP seemed due to its less solubility in alkaline soil conditions. On overall basis, SSP was the best source of P under the studied soil conditions.
Tahir Hussain,, G. Jilani, M. Sarwar* . (1992) COMPARISON OF DIFFERENT PHOSPHORUS SOURCES FOR RICE AND SUBSEQUENT BERSEEM CROP PRODUCTION, The Journal Soil & Environment , Volume 7, Issue (1-2).
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