ABILITY OF RHIZOBIAL STRAINS (R .leguminosarum ) IN SOLUBILIZATION OF ROCK-PHOSPHATE

A Factorial experiment was conducted using (RCBD) to determine the ability of three strains of R. Leguminosarum Le719, Le726 and Le735 (which we it get it from ICARDA) on the solubility of rock-phosphate, calcium ,and pH media. The results showed an ability of strains understudy in the solubility rock-phosphate .The data was found significantly different when 200 and 400 gP.ml-1 was used (source rock phosphate). Strain Le719 had the supererioerty effect in solubilizing rock phosphate with an increase of 3.99% and 2.15% for the treatments mentioned above respectively. However strain Le735 showed less increasing effect and with no significant effect for strain Le726. In the same trend an increase in the solubility of calcium was observed (as a result of in crease in soluble phosphate) in media and in the same manner for the strains . Strain Le719 was increased by 143.36% compared to control treatment. Media reaction (pH-media) was decreased in media inoculated by the strains used. pH-media was 5.62, 6.20, and 6.43 for strains Le719 , Le735 , and Le726 respectively.