A field experiment was conducted during kharif, 2012 in a sandy clay loam, high P Alfisol at college farm College of agriculture, Rajendranagar, Hyderabad to study the response to P levels (0, 30 and 60 kg P2O5 ha-1) either alone or in combination with PSB @ 5 kg/ha, biochar @ 5 t/ha, humicacid @ 20 kg ha-1 and citricacid @ 10 mM on the inorganic Phosphorus fractons in the rhizosphere soils of soybean crop. Among the inorganic P fractions estimated, Saloid-P is the smallest pool and Ca-P is the largest pool accounting for 0.5 and 77.4 per cent respectively of the total inorganic pool in initial soil. Saloid-P at flowering was 5.27 ppm, which was higher than that of 4.11 ppm at harvest. The Ca-P is the largest fraction of inorganic P and accounted for 75 % of total inorganic P at flowering that increased to 83.6 per cent at harvest. Inorganic P application increased the inorganic P fractions indicating the fixation of applied and native P. At both flowering and harvest stages, showed a significant reduction in the size of fixed P pool or increased the available P due to the application of biochar @ 5t/ha followed by the humic acid @ 20 kg/ha. When interaction effect was considered, application of inorganic at 30 kg P2O5 ha-1 incombination with biochar @ 5 t/ha recorded significantly higher inorganic P fractions
