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Fertilizer studies on rice. I. Effect of three seed rates and three nitrogen rates on the yield of paddy rice (var.R). II. Effect of different sources of phosphate on yield and P content of Bluebelle rice. III. Available soil phosphorus estimations at varying levels of different phosphates at M.A.R.D.S. IV. Effect of three rates of NPK and their interaction on the yield of Bluebelle rice. V. Effect of three rates of NPK and their interactions on the yield of IR-8 rice (second crop). VI. Yie



Fertilizer studies on rice. I. Effect of three seed rates and three nitrogen rates on the yield of paddy rice (var.R). II. Effect of different sources of phosphate on yield and P content of Bluebelle rice. III. Available soil phosphorus estimations at varying levels of different phosphates at M.A.R.D.S. IV. Effect of three rates of NPK and their interaction on the yield of Bluebelle rice. V. Effect of three rates of NPK and their interactions on the yield of IR-8 rice (second crop). VI. Yie



Agricultural Research Guyana 4: 43-75



n a clay soil maximum yields in the spring were obtained with 44.8 kg/ha N; no significant effect of seed rate nor any significant interaction between seed rate and N rate was observed. Neither the yield nor the P content of Bluebelle rice was significantly affected by different sources of P (hyper rock phosphate, basic slag, triple superphosphate). A yield response to P can generally be expected when the soil P level is 5-10 ppm (25-50 lb/acre).

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