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Dynamics of Phosphorus Fractions in a Calcareous Vertic Haplustepts Under AICRP-LTFE Soils
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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 (8th 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.
Keywords
AICRP-LTFE Soils, Total Phosphorus, Total Inorganic Phosphorus, Organic Phosphorus, Fractions of the Inorganic-P, Saloid Bound-P, Al-P, Fe-P, Reductant Soluble-P, Occluded-P And Calcium-P.
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