Dynamics of Phosphorus Fractions in a Calcareous Vertic Haplustepts Under AICRP-LTFE Soils

Available status of P in LTFE soils was decreased after long run, but that was also increased in treatments where FYM application was there i. e. T₈ and T₉. There was overall increase in inorganic-P and total-P status, but status of available-P decreased due to calcareous soil, but due to chelating effect of organic material in treatments T₈ and T₉ there was increase in the availability of phosphorus after long run in the LTFE soils. Available-P status of LTFE soil at initial stage was low in category (<28 Kg P₂O₅ ha^-1) in most of the treatments, after long run (8^th year) it was more decreased except in treatments which were received FYM (T₈ and T₉). Due to application of FYM available status of P₂O₅ in LTFE soil increased up to high category (>56 Kg P₂O₅ ha^-1) from low category. After a span of 8 years most of the fractions of phosphorus depleted negatively i.e. increased in status, but there was also found positive depletion in case of Al-P, Fe-P, Ca-P and available-P, it might be attributed to transformation of phosphorus and plant uptake as an available-P. Application of FYM also prevents depletion in available-P status of soil.