Influence of poultry manure on phosphorus availability and the standard phosphate requirement of crop estimated from quantity-intensity relationships in different soils
2002
Bahl, G.S. | Toor, G.S.
Twelve samples comprising of non-calcareous, calcareous and acidic soils were used to study P availability parameters and standard phosphate requirement (SPR) in the presence and absence of poultry manure (PM). Adsorption of P and phosphate potential decreased while Olsen extractable P increased by PM addition, the extent varying with the type of soil. The calculated SPR to attain soil solution concentration of 0.2 micrograms P ml-1 was invariably higher in fine textured soils. Acid and calcareous soils registered higher SPR compared to non-calcareous soils. PM addition lowered the SPR in all the soils. The observed P supplementation through PM ranged from 11.6% to 100% signifying no fertilizer P need in the latter. Calibration curves were drawn for calculating the SPR for a given soil solution P concentration without and with the addition of PM.
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