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Potential of Zinc Solubilising Micro-Organisms in Soil
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Zinc (Zn) is an essential element necessary for plant, humans and micro-organisms required relatively in small concentrations (5–100mg kg-1) in tissues for healthy growth and reproduction of plants. It is considered as one of the eight essential trace elements required for crop growth and production. It is present on earth’s crust in tune of 0.008 per cent and zinc has an important role in nutrition and metabolic activities of both eukaryotic and prokaryotic organisms and act as a cofactor or metal activator in various enzymatic systems. Plants absorb Zn as zinc ions (Zn2+). Since Zn does not have variable valence, it has no role in influencing oxidation-reduction (redox) processes directly.The worldwide prevalence of Zn deficiency in crop is due to low solubility of Zn, rather than low Zn availability in soil (Iqbal et al., 2010). The unavailable zinc can be reverted back to available form by application of bacterial strain capable of solubilizing it.
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