NPK levels on soils grown to rice-mungbean pattern and their effects on rice pests and yield of rice
2010
Mirandilla, JR.F. | Garcia, F.D. | Obaña, A.B. | Amar, G.B. | Ramos, F.M., Philippine Rice Research Inst., Isabela, Malasin, San Mateo, 3118 Isabela (Philippines)
Intensive rice cropping system (rice-rice, rice-cereal) may decline the capacity of soil to supply nitrogen (N). It also requires more fertilizers. In San Mateo, Isabela mungbean is grown after rice cropping. The study aimed to determine the role of mungbean in rice production in terms of reduction of insect pests and nutrient availability. A field experiment was conducted in PhilRice Isabela experimental station in 2009 wet and dry seasons to evaluate the effect of rice-mungbean on NPK availability and on rice pests. Based on the results, there was a slight decrease in insect pest population in the cropping patterns of rice-mungbean (with or without application of N in rice) compared with rice-rice cropping patterns. Rice with application of N-mungbean cropping pattern compared with rice-rice with application of cropping pattern, 3.95 tons/ha and 3.64 tons/ha, respectively. Rice-mungbean cropping patterns can contribute in the accumulation of available phosphorous and extractable potassium. Yield was significantly higher in rice-mungbean pattern without application of N fertilizer compared to rice monocropping pattern. This is significant because San Mateo, Isabela farmers were claiming that planting mungbean after rice saves them one bag of urea per hectare.
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