RBFS [rice-based farming systems] for the uplands [integrated crop management, Philippines]
2003
Anon.
Uplands have low productivity mainly because of low soil fertility. The accuracy of the NuMaSS [nutrient management support system], a software that can diagnose, predict and recommend fertilizer to increase yields of crops like rice, corn, and legumes, was continued to be validated in the field. Predicted N (140 kg/ha) P(45 kg/ha) and lime (6 t/ha, residual) increased the yield of upland rice by 1,033, 1,900, and 1,119 kg/ha, respectively. Peanut and soybean responded to N only at higher rates. The predicted P rate improved peanut yield by 1,447 kg/ha and soybean by 721 kg/ha. Peanut responded to P higher than the predicted rate, but soybean did not. Only peanut had increased yield with the predicted lime rate. The agreement index between predicted and actual yields of crops using the NuMaSS decision-aids for N, P, and lime was very close indicating excellent prediction. For upland rice, agreement index was 1.01, 0.97 for corn, 1.07 for peanut, and 1.11 for soybean. Green manure (5,000 kg/ha) and lime (6,000 kg/ha and 4,000 kg/ha for cereals and legumes) applied alone or in combination had varied effects. Green manure alone did not improve yield of upland rice, but combining it with lime increased yield by as much as 1,036 kg/ha. In corn, green manure alone increased yield and increased further when lime was also applied. Peanut yield was higher with lime alone than with green manure alone or in combination with lime. The imposition of the NuMaSS decision-aid treatments for N, P, and lime showed significant increase in soil pH, available P, exchangeable Ca and significant decrease in exchangeable A1
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Este registro bibliográfico ha sido proporcionado por University of the Philippines at Los Baños