Influence of organic residue on chemical equilibrium phases resulted from phosphorous addition

Abstract

Lab. experiment was carried out in Al-Musaib tech. college to study the effect of organic residue and phosphours fertilizer on phosphours phases in three treatments included soil only , soil and organic residue 1:1 and organic residue only and five phosphors fertilizer levels (0 , 100 , 200 , 400 and 800 ) kg P hectar for eight weeks incubation period . Results of this study indicated the existence of octacalcium phosphate OCP , dicalcium phosphate DCP and dicalcium phosphate dihydrate DCPD in the soil treatment only and the existence of dicalcium phosphate dihydrate in the soil and organic residue treatment and the existence of dicalcium phosphate dihydrate with different degree of saturation in the organic residue treatment , also results of this study indicated clear effect of increasing the phosphorus fertilizer level on the existence of phosphorus phases in the whole treatments .