The inter relationship between different fractions of phosphorus was studied in the soils of a cropping sequence (Fingermillet - Maize - Blackgram) treated with different phosphorus sources. The available P (Olsen's P) is positively related with Saloid-P and AI-P. The positive relationship of Fe-P with available P existed in the first two crops vanished in the third crop. The RS-P is not dependent on the available P. Over a period of time Ca-P is also having positive relationship with available P and A1-P.
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