Nitrogen and phosphorus mineralization and release of potassium from distillery effluent in two soil types
Torres, F.G. | Hernandez, N.O. | Sison, M.L.Q. | Magbanua, J.P.V. | Bugante, E.C. | Migo, V.P. | Nayve, F.R.P. | Fernandez, W.L. (Philippines Univ. Los Banos, College, Laguna (Philippines). National Inst. of Molecular Biology and Biotechnology)
An incubation study was conducted to obtain information on nitrogen and phosphorus mineralization and release of potassium from distillery effluent in Magallanes sandy loam and La Paz fine sand. Distillery effluent at the rates of 0, 100 and 200 cu m/ha was applied to 5 kg soil placed in pots. Moisture content of the soils was adjusted to 70% field capacity and maintained throughout the incubation period. Available N, total N, exchangeable K, and available P as well as population of fungi, bacteria and actinomycetes were determined periodically. The addition of distillery effluent at the rate of 200 cu m/ha increased mineral N released by Magallanes sandy loam and La Paz fine sand. Mineralization rates in both soil types were slow without distillery effluent amendment. The rates were increased in La Paz fine sand and Magallanes sandy loam by 58 and 83%, respectively, over the control by 200 cu m distillery effluent/ha application. Distillery effluent amendment (200 cu m/ha) increased the number of fungi significantly. Although not significant, addition of 200 cu m distillery effluent/ha increased the number of actinomycetes but not bacteria. Addition of distillery effluent at the rate of 200 cu m in both soil types increased available P and exchangeable K
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