G. B. Pant University of Agriculture and Technology, Pantnagar, Nainital, U. P.
*Publication: p. 850 under Journal series of Experiment Station, G. B. P. U. A. T., Pantnagar, Nainital, U. P.
Incubation studies revealed that a mixture of rock phosphate and low-grade pyrites in suitable proportions would be quite effective as P source in alkaline soils (pH 7.65) but this mixture offered little extra advantage in acid (pH 5.05) and neutral (pH 7.05) soils. In the latter soils soybean straw as well could not bring about meaningful increase in release of P from rock phosphate, while it showed marginal improvement in the alkaline soil. The beneficial action of pyrites and soybean straw, whatsoever, was not found to be additive. The release of P from rock phosphate was apparently a slow process showing maximum availability at 30th day after application.
Pyrites, organic matter, rock phosphate
