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Potassium is one of the essential nutrient required for higher and sustainable productivity of crops. It is third important plant nutrient after Nitrogen (N) and Phosphorus (P). Potassium (K) is required for activation of enzymes which are fundamental to metabolic processes, especially the production of proteins and sugars (Johnston, 1986). It is also essential for opening and closure of stomatal guard cells or daily changes in the orientation of leaves (Shehata and El-Khawas, 2003). K is present in soil with a range between 0.04 3% and only 1 to 2% of this is available to plants.

Isolation, Biochemical Characterization and Potassium Solubilzation Efficiency of Different Microbial Isolates