P-nutrition in rice-wheat cropping system with microbial consortia.

摘要

Results revealed that the yield of paddy and wheat were significantly higher due to inoculation with blue green algae (BGA), phosphate solubilizing bacteria (PSB) and vesicular arbuscular mycorrhiza (VAM) at 30 kg P2O5 as single superphosphate (SSP) plus 30 kg P2O5 as Udaipur rock phosphate (URP) over alone 30 kg P2O5 either as SSP or URP or control but at par with 60 kg P2O5 as SSP. The quality of grain and straw, in terms of percentage of nitrogen and phosphorus, were significantly superior to that of full dose of phosphorus as SSP, single inoculants or control. Soil health was improved in terms of carbon buildup, residual soil nitrogen and soil available phosphorus. Results have clearly demonstrated that 30 kg P2O5 as SSP can safely be replaced with 30 kg P2O5 as URP in the presence of BGA, VAM and PSB as inoculant. Additional yields of paddy (1.91 q ha-1) and of wheat (2.31 q ha-1) were obtained with a net saving of Rs. 2907 as phosphate fertilizer input cost.