Author(s): M Geethalashmi and Dr. P Sangameshwari

Abstract: Phosphorus plays a significant role in several physiological and biochemical activities in plants. Phosphorus in soils is immobilized due to formation of insoluble complexes such as iron and aluminium hydrous oxides and calcium carbonate. Phosphate-solubilizing microorganisms (PSM) play an important role in insoluble phosphates into soluble forms involves processes of acidulation, ion chelation and exchange reactions. Present study, a field experiment was carried out to study the Growth parameters of phosphate solubilising inoculants (JumpStart) on rice variety CO 47 in rice crop. The present study revealed that the treatment P3S3 (100% P + JumpStart 10E5) was recorded increased Seedling Growth will be increase in P3S3 treatment. The Plant Height will be increased at grain filling (111.67 cm), Root/ Shoot ratio (0.494 mg g-1) and Root Volume will be increased at Active tillering and 50% flowering stage. The uptake of phosphorus by plants was found higher in P3S3 treatment observed at all stages of crop growth. At 50% flowering stage, phosphorus (69.26 kg ha-1), uptake were observed higher in P3S3 treatment than control. This might be due to the significant increment of major Growth Parameters such as Root and Shoot ratio by the application of 100% recommended phosphorus with seed treatment of JumpStart 10E5.

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