An investigation was undertaken during 2018-19 in Southern zone of A.P. to study the Status of available phosphorus and forms of Phosphorus in soil under major cropping systems of Nellore district. The Ca-P was observed to be the predominant P fraction under all major cropping systems could be attributed to high CaCO3 content. The highest mean values for saloid-P (16.67 mg kg -1 ), total-P (538.21 mg kg -1 ) and other forms of P (342.07 mg kg -1 ) were recorded in groundnut-paddy cropping system and Fe-P (68.77 mg kg -1 ) and Al-P (61.85 mg kg -1 ) were highest in paddy-paddy cropping system, whereas available P2O5 (166.82 kg ha -1 ) and Ca-P (173.15 mg kg -1 ) were highest in groundnut-paddy and fallow-bengalgram systems, respectively. pH showed positive and significant relation with total-P (r= 0.507**) and other forms of P (r= 0.573**) where as free CaCO3 showed positive and significant correlation with Ca-P (r= 0.432*) in calcareous soils of S.P.S.R. Nellore district. Available P2O5 showed positive and significant correlation with saloid-P (r= 0.456*), Al-P (r= 0.765**) and Fe-P (r= 0.559**), saloid-P showed significant and positive correlation with total-P (r= 0.477*) and other forms of P (r= 0.510**). Al-P showed positive and significant correlation with Fe-P (r= 0.885**). Similarly, Ca-P showed positive and significant relation with total-P (r= 0.418*).
Phosphorus fractionation study in soils of Y.S.R. Kadapa district, A.P, was studied in relation to soil properties in which 5 soil samples collected from each major cropping system were analysed for different physico-chemical properties and different P fractions.
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