Vol. 10, Issue 5 (2021)

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 different Phosphorus fractions and their relationship with Soil properties under major cropping systems of Chittoor district. Majority of the soils were moderately alkaline in reaction, non-saline, free lime content indicating that these soils are moderately calcareous, medium to high in available P₂O₅.The highest mean values for saloid-P (28.28 mg kg^-1), Fe-P (50.68 mg kg^-1), total-P (490.28 mg kg^-1) and other forms of P (406.44 mg kg^-1) were recorded in Sugarcane mono cropping system and available P₂O₅ (113.57 kg ha^-1) and Ca-P (108.26 mg kg^-1) were recorded in Bajra-Groundnut cropping system. Free CaCO₃ showed positive and significant correlation with saloid-P and Ca-P. Available P₂O₅ showed positive and significant correlation with Al-P and Ca-P, whereas, saloid-P showed significant and positive correlation with Fe-P and total-P, Fe-P showed positive and significant correlated with total-P and other forms of P. Total-P showed positive and significant relation with other forms of P.