Author(s):

GK Surya Krishna, T Giridhara Krishna, V Munaswamy and Y Reddi Ramu

Abstract: 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*).

DOI: 10.22271/phyto.2020.v9.i6d.12894

Pages: 262-266  |  1159 Views  382 Downloads

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