In the present investigation we studied the extent of variation among barley genotypes (Hordeum vulgare L. cv. Alexis, Canut, Digger, Etna, Peel) in their ability: i) to induce activity of soluble extracellular phosphatase in rhizosphere soil. ii) to withdraw bicarbonate extractable organic phosphorus (NaHCO3 -Po ). All the genotypes induced 3-4 times higher phosphatase activities in rhizosphere soil as compared to bulk soil. Among the genotypes, there were significant (p > 0.01) differences in soluble extracellular and non-soluble phosphatase activities and depletion of NaHCOa-Po in soil near their root mats. Etna induced highest phosphatase activities and depleted most NaHCO3-Po from the rhizosphere soil. A high correlation (r = 0.79) was found between the activity of soluble extracellular phosphatase and the quantity of NaHCO3-Po withdrawn from the rhizosphere soil by the barley genotypes.

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