Transformation of Added P into Inorganic P Fractions in Some Acid Soils of Himachal Pradesh

In a study on the transformation of P added at the rate of 0,50,100 and 150 ppm to three acid soils of Himachal Pradesh and incubated for 1,7,30 and 90 days, it was found that most of the added P was transformed into Al-P, Fe-P and very little to Ca-P fractions at one day interval. The added P which was transformed into Al-P increased up to 7 days and later decreased slowly with time up to 90 days at all the levels of application. The conversion of added P into Fe-P fraction increased slowly with time up to 90 days and very little was changed to Ca-P even at prolonged time intervals at all the levels. Transformation of added P into Al-P and Fe-P fractions were found to be related to pH, clay, organic matter, sesquioxides and P fixing capacity of soils.