Development of site-specific nutrient managment (SSNM) recommendations for irrigated rice in Region 6 (Capiz, Aklan, and Antique [Philippines])
2012
Gabinete, G.G., West Visayas State Univ., Lumbanao, Iloilo (Philippines) | Samson, M.I., International Rice Research Inst., Los Baños, Laguna (Philippines). Crops and Environmental Sciences Div. | Penaranda, H.D., Department of Agriculture, Regional Field Unit 6, Capiz (Philippines) | Gutierrez, B.A., Capiz State Univ., Burias Campus, Capiz (Philippines) | Buresh, R.J., International Rice Research Inst., Los Baños, Laguna (Philippines)
This study was conducted to develop site-specific nutrient management recommendations for irrigated rice in Aklan, Antique and Capiz [Philippines]. The study used the nutrient omission plot technique to collect essential information to tailor NNutrient Manager for Rice, a computer based decision tool, and conducted field trials to compare the performance of SSNM-based fertilizer recommendation of Nutrient Manager for Rice with the farmers' fertilizer practices. Results showed that nitrogen was limiting across Aklan, Antique, and Capiz indicating the need for fertilizer N to achieve target yields. Yield gain for fertilizer N was highly variable across farmers' fields indicating a need for field-specific fertilizer management. Mean yield gains from fertilizer P, K, and Zn were small, but the range across seasons and location was very high indicating the need for field-specific fertilizer management. Yields were relatively lower in Antique than in Capiz and Aklan which were attributed to constraints other than nutrients. Measured soil properties were not well related to yields measured in nutrient omission plots suggesting that soil properties are not good predictors of indigenous nutrient supply in rice soils. The measured relationships of yield in nutrient omission plots with yield in full fertilized plots in Region 6 were comparable to relationships from other parts of the Philippines already used in Nutrient Manager for Rice. This provides confidence that Nutrient Manager for Rice is well adapted for Region 6. Improved management of fertilizer N, P and K based on the principles of SSNM as used in Nutrient Manager for Rice increased yield (0.37 t/ha/season) and profitability (9%) for rice farming. The results suggest that increased profitability of Php4500 per hectare per rice-growing season is a realistic target with Nutrient Manager for Rice, which uses the same SSNM-based approach.
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