GROWTH, SURVIVAL AND SHELF LIFE ENHANCEMENT OF PHOSPHATE SOLUBILIZING BACTERIAL LIQUID INOCULANTS FORMULATIONS WITH POLYMERIC ADDITIVES

Phosphorus (P) is the most critical macronutrient required by both plant and microorganisms, and it is highly deficient in Indian soils. Total P content in agricultural soils lies in the range of 200-500 mg/kg but available ‘P’ is very low. The average utilization efficiency of added fertilizer P by plants ranges from 15-25 percent (Ali et al., 2014). Phosphate solubilizing bacteria (PSB) is one of the most promising bacteria that solubilize the ‘P’ from insoluble fixed forms by production of organic acids, phenolic compounds, protons and siderophores and make the P available to the plants which enhances its availability during crop growing season and results in increased crop production (Rodriguez et al., 2006; Sharma et al., 2014). PSB have also known as plant growth promoting rhizobacteria (PGPR) because they colonize the plant roots, promote the growth of the plants by increasing nutrient content in soil and supply phosphate to plants in environment-friendly and sustainable manner (Das and Singh, 2014).

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