The influence of superphosphate and farm yard manuro on equal phosphorus basis and their combinations, on the available phosphorus status of soil was studied using two strains of ragi Co. 1 and Co. 7 and also in fallow plots throughout the growth period. Plots where Co.7 ragi was grown had higher amounts of available phosphorus. Plots receiving combinations of supor and farm yard manure had always higher amounts of available P than plots receiving them alone. Combinations com- prising low amounts of farm yard manure and higher amounts of superphosphate proved to be best. Superphosphate was better than farm yard manure when applied individually on equal P basis.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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