Abstract

                                An incubation experiment was conducted with the soil collected from Noyyal series (Vertic Ustochrept Coimbatore) to study the dissolution and release pattern of phosphorus from Jhabua rock phosphate by following the modified phosphorus fractionation technique, which involved both alkaline and acid extractants. The solution P (NaCl TEA P) and solution plus adsorbed P (NaOH P) were high in the treatment receiving 50 per cent JRP plus 50 per cent SSP followed by the application of 100 per cent JRP along with PB and FYM. Acid soluble P or apatite P (HCI-P) was the highest in 100 per cent JRP alone and along with FYM or PB or both whereas the residual P content of the different treatments were comparable. With advancement of the incubation period upto 60 days, a increased trend in extractable P was found in NaCI TEA-P and NaOH-P and a decreased trend was noticed in HCI-P and Residual -P fractions.

Key words : Dissolution, Jhabua rock phosphate, Incubation