Phosphate Solubilizing Biofertilizers as a component of INM These organisms secrete organic acids that solubilize insoluble phosphorus which becomes then.

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Phosphate Solubilizing Biofertilizers as a component of INM These organisms secrete organic acids that solubilize insoluble phosphorus which becomes then available for plant absorption. and fungi efficiently solubilize insoluble phosphate in the soil as well as the inert phosphorus sources. Many heterotrophic bacteria and fungi efficiently solubilize insoluble phosphate in the soil as well as the inert phosphorus sources. INTRODUCTION

Phosphate Solubilizing Biofertilizers as component of INM Many bacteria belonging to Bacillus, Pseudomonas Flavobacterium Micrococcus Streptomyces and fungi belonging to Aspergillus, Penicillium and Trichoderma efficiently solubilize insoluble phosphate of rock phosphate groups. These organisms secrete organic acids that solubilize insoluble phosphorus added to the soil, which then becomes available for plant absorption.

Types of Phosphate Solubilizing Bacteria Spore Rod shape Flagella Pigmentation Colony BACILLUS PSEUDOMONAS Phosphate Solubilizing Biofertilizers as a component of INM

Phosphate Solubilizing Fungi Aspergillus awamori Aspergillus conidiaAspergillus colony Aspergillus fruiting body Penicillium Trichoderma viridi Phosphate Solubilizing Biofertilizers as a component of INM

Mechanism of Phosphorus solubilization Organisms are Pseudomonas, Bacillus, Aspergillus Penicillium, Trichoderma Bacteria and fungi secrete organic acids. Organic acids dissolve insoluble phosphorus present in soil. Phosphate Solubilizing Biofertilizers as a component of INM

Selection Procedure Grow bacteria / fungi in specified media containing insoluble phosphate. Incubate and observe the clearing zone around colonies. Quantify the phosphorus dissolved by specified organism. Select efficient culture based on above criteria. CLEAR ZONE AROUND BACTERIAL COLONIES INDICATE DISSOLUTION OF INSOLUBLE PHOSPHATE Phosphate Solubilizing Biofertilizers as a component of INM

Treatment Wheat Rice Chickpea Grain yield Grain yield Grain yield Control P. striata B. polymyxa A. awamori Rock phosphate RP+ P. striata RP+ B. polymyxa RP+ A. awamori Super phosphate Phosphate solubilizing biofertilizer enhance yield of Wheat, Rice and Chickpea (Kg/h) PSB increase crop yield by 5-10 %

LET US SUM UP These organisms solubilize phosphate by secreting organic acids that render solubilization of insoluble phosphorus added to the soil, which then becomes available for plant absorption. These organisms solubilize phosphate by secreting organic acids that render solubilization of insoluble phosphorus added to the soil, which then becomes available for plant absorption. Phosphate Solubilizing Biofertilizers as a component of INM Many heterotropjic bacteria and fungi efficiently solubilize insoluble phosphate of soil and rock phosphates. Inoculation of phosphate solubilizing micro organisms increase crop yield by 5-10 %. The integrated use of rock phosphate and PSM add kg P 2 O 5 /ha.