PERFORMANCE OF PHOSPHORUS-CARRIERS IN WETLAND RICE (ORYZA-SATIVA) ON RIVERINE ALLUVIALS

A field experiment was conducted during the rainy season of 1991 and 1 992 to find out the effect of phosphorus levels and soul ces on growth and yield of rice (Oryza sativa L.). Phosphorus had a marked benefici al impact on seedling establishment, root biomass and days to flowerin g, A significant improvement in yield was noticed up to 60 kg P2O5/ha. Application of P @ 30 and 60 kg P2O5/ha increased the grain yield by 13 and 22% respectively over no-P application, Out of different P soul ces, ammonium polyphosphate gave significantly superior yield to rest of P forms except with diammonium phosphate. Rock phosphate either so le or amended with P-solubilizing bacterial culture oi superphosphate gave lower yields.