Phosphorus Fractionation in Submerged Black Soil as Influenced by Different Phosphatic Fertilizers

A laboratory incubation experiment was conducted during December, 2017 to March, 2018 in Department of Soil Science and Agricultural Chemistry, College Agriculture, Raichur, Karnataka, India study the fractionation phosphorus (P) black soil amended with different phosphatic fertilizers under submerged condition. The were kept subemerged condition for 90 days phophatic such as single super phosphate (SSP), diammonium (DAP) mussoorie rock (MRP) alone or combination FYM PSB added through 13 treatment combinations. analyzed various inorganic P fractions (saloid P, Al-P, Fe-P, RS-P, occluded P,Ca-P) at definite intervals. results showed that calcium bound (Ca-P) dominant fraction whereas saloid recorded least fraction. It has seen application significantly increased all over control. All forms viz., aluminium (Al-P), iron (Fe-P),reductant soluble (RS-P) higher DAP along compared SSP MRP Ca-P period. 1st day after which it decreased passage time.