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Soil Phosphorus Fractionation Studies¹

ABSTRACT

Total soil phosphorus in 21 soils was fractionated into 5 components viz. (a) calcium phosphate, (b) adsorbed phosphate, (c) iron and aluminum phosphate, (d) organic phosphorus and (e) phosphorus which is insoluble in the reagents which dissolve (a), (b), (c) and (d) fractions. It is found that none of these forms of soil phosphorus is a definite fraction of total phosphorus. The amount of adsorbed phosphate gives the highest correlation (r = + 0.8341 significant at 1% level) with the uptake of phosphorous by sorghum plants. Also the amount of adsorbed phosphate gives a highly significant correlation (+0.9330 significant at 1% level) with available phosphate determined by 0.5M NaHCO₃. There is also a correlation between the uptake of phosphate by sorghum plants and the amount of calcium phosphate, but the level of significance is much lower. There is no significant correlation between the plant uptake of phosphate and the amount of phosphorus in any one of the three remaining fractions, namely iron and aluminum phosphates, insoluble phosphate and organic phosphorus.

¹ Based on the thesis submitted to Sardar Vallabhbhai University, Anand, India by the senior author for M.S. degree.

² Research Assistant and Professor of Agricultural Chemistry, respectively, Institute of Agriculture, Anand, India.

Received for publication July 25, 1960. Accepted for publication September 15, 1960.