Bio-Organic Influence on Phosphatic Fertilizers Under Wetland Rice Ecosystem in an Alfisol

The efficiency of P fertilizers of varying water solubility was evaluated by comparing the grain yield, P uptake and economic returns. The results revealed that application of SSP @ 50 kg P₂O₅ha^-1+ Azophos @ 2 kg ha^-1+ FYM @ 12.5 tha^-1 recorded the highest grain yield (4760 kg ha^-1). Among the P sources, highest grain yield was recorded due to the application of SSP as compared to URP. Among the microorganisms inoculated, Azophos enhanced the rice yield followed by VAM and phosphobacteria. The B: C ratio was higher under SSP @ 50 kg P₂O₅ ha^-1 + Azophos @ 2 kg ha^-1. Though the B:C ratio was low in FYM treated plots, incorporation of FYM increased the grain yield and P uptake. For better dissolution of P, Azophos can be used as an efficient P solubilizer under low land ecosystem.