Mobilization of Rock Phosphate Phosphorus through Bacterial Inoculants to Enhance Growth and Yield of Wetland Rice
2011
Rajapaksha, R. M. C. P. | Herath, D. | Senanayake, A. P. | Senevirathne, M. G. T. L.
Pot and field studies were undertaken to assess the substitutability of triple superphosphate (TSP) by a phosphorus (P) fertilizer mixture (PFM) comprising TSP, rock phosphate (RP), and P-solubilizing bacterial inoculants for wetland rice. Six single and two dual inoculants were formulated with Enterobactor gegovie and five Bacillus species and tested in pot and field experiments. Soil-available P and tissue P contents were analyzed, and yield data were recorded. In the pot experiment, the dual inoculant containing E. gegovie + B. mycoides and the single inoculant B. subtilis increased yields by 32% and 25%, respectively, over the TSP control. Under field conditions, E. gegovie + B. subtilis, and E. gegovie + B. pumilus increased grain yield by 22–27% over the TSP control (574 g m⁻²). Results revealed that 50% of TSP could be substituted with RP along with seed inoculants formulated with E. gegovie, B. pumilus, and B. subtilis under tested conditions.
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