title: Influence of poultry manure on phosphorus availability and the standard phosphate requirement of crop estimated from quantity-intensity relationships in different soils.
abstract: 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 microg 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.
mesh_terms: D000818:Animals; D001682:Biological Availability; D005308:Fertilizers / Q000592:standards; D008372:Manure; D010710:Phosphates / Q000378:metabolism* / Q000592:standards; D010758:Phosphorus / Q000378:metabolism*; D011200:Poultry; D012680:Sensitivity and Specificity; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D013025:Glycine max / Q000378:metabolism / Q000592:standards
chemical_list: D005308:Fertilizers; D008372:Manure; D010710:Phosphates; D012987:Soil; D010758:Phosphorus