Abstract

                                Continuous manuring and fertilization in an intensinve cropping on an Alfisol resulted in less depletion of inorganic P fractions viz., Saloid-P (16.6%), Fe-P (14.1%), Al-P (14.4%), Ca-P (16.5%) and more of organic-P (40.6%) in surface soil. Regular addition of green leaf manure (GLM) enhanced saloid-P, A1-P and Fe-P and Fe-P whereas farm yard manure (FYM) addition influenced Ca-P and organic-P. Continuous P addition either alone or in combination with Nand Kenhanced both inorganic and organic-P fractions than the treatments haveing no P.

Key words : Continuous manuring, Phosphorus fractions.