On-farm testing of NuMaSS to manage fertilizers in uplands
2005
Dollentos, R.T., Casimero, M.C. (Philippine Rice Research Inst., Maligaya, Science City of Munoz, 3119 Nueva Ecija (Philippines)) | Escabarte, R.S., Ysulat, F.I., Asuncion, Q.I., Macarubbo, B.M., Maramag, I.M., Yost, R.S.
The Nutrient Management Support System (NuMaSS) is a computer-based decision-aid tool that is capable of diagnosing soil constraints, predicting and recommending the Nitrogen (N) and phosphorus (P) fertilizer and lime requirements of cereals (rice and corn) and legumes (soy bean, peanut and mung bean). To validate the capability of NuMaSS, an on-farm trial was conducted in the 2003 WS (rice) and 2004 WS (corn) in Iligan, Isabela and 2004 WS (rice and corn) in Antipas, North Cotabato and Tampakan, South Cotabato. [Philippines]. Results showed the yields of rice and corn were significantly increased using the NuMaSS recommendation (NR). The yield of corn grown in all sites had exceeded the target yield of 5 tons/ha. The target yield 2.5 t/ha for rice was attained in South Cotabato but not in North Cotabato and Isabela due to the adverse climatic condition. Analysis of the net returns against the cost of the varying amount of fertilizers showed that NR was significantly profitable in corn grown in Isabela and South Cotabato. Poor net return of NR was observed in corn grown in North Cotabato, and rice in South Cotabato and Isabela due to the added cost of lime and higher amounts of recommended fertilizers. Moreover, soil pH, residual P, organic carbon, and exchangeable bases (K, Ca, and Mg) increased after cropping in plots where NuMaSS recommendation was applied. Conversely, exchangeable Al ions and acidity decreased resulting in higher ECEC and lower Al saturation of the soil.
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