Soil organic matter management in the rainfed areas
2005
Alquiza, P. C. | Baysac, F. S. | Ildefonso, L. A. | Castro, R. C.
Based on laboraory analysis, most soils in the rainfed areas of Ilocos contain low level of organic matter.This situation creates soil nutrient imbalances resulting in low crop yields. Strategies in the improvent of rainfed areas through soil organic matter management are being conducted. Field experiments on organic fertilizer management were implemented during the DS and WS in 2004 in the experimental farm of PhilRice Batac and farmers' field. Application of of 10 bags PCM + 50% (46-18-18kg NPK/ha) of the recommended inorganic fertilizer rate produced rice yield similar with that applied with 20 bags PCM/ha +46-18-18 kg NPK/ha. In onion, application of 15 bags PCM + 100% (120-60-60kg NPK/ha) of the recommended inorganic fertilizer rate produced significantly bigger bulbs and higher yield than these applied with 20 bags PCM +120-60-60 kg NPK/ha and 10 bags PCM +120-60-60 kg NPK/ha. Corn applied eith 100% (120-60-60 kg NPK/ha) of the recommended inorganic fertilizer rate produced higher yields than the control. Application of 10 bags PCM/ha +120-60-60 kg NPK/ha produced yields similar with those applied 20 bags PCM/ha +120-60-60-60 kg NPK/ha. In rainfed lowland rice, application of 10 bags PCM + 100% (92-35-35 kg NPK/ha) of the recommended inorganic fertilizer rate produced the highest yield. Partial budget analysis showed that application of 10 bags PCM + 100% (92-35-35 kg NPK/ha) of the recommended inorganic fertilizer rate obtained the highest net benefit (P24, 075). In farmers' fields, the organic fertilizer produced by the farmer cooperators through composting was as efficient as commercially available organic fertilizers.
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