INFLUENCE OF PHOSPHATE SOLUBILIZING MICROORGANISMS ON SOIL PHOSPHORUS AVAILABLITY AND FABA BEAN YIELD UNDER CALCAREOUS SOIL CONDITIONS.

Document Type : Original Article

Authors

Soils Dept., Fac. of Agriculture, Mansoura Univ., Egypt.

Abstract

         Availability of phosphorus to plant is impaired in the calcareous soils due to the formation of poorly soluble calcium phosphate minerals. This work aimed to investigate the influence of phosphate solubilizing microorganisms on the availability of soil phosphorus and faba bean yield under calcareous soil. Accordingly a pot experiment was carried out during the winter season of 2010-2011 under the greenhouse of the Experimental Farm of the Faculty of Agriculture, Mansoura University. The experiment was conducted in a split plot design; which consisted of six main treatments of microorganisms (Control, Microbin, Mycorrhiza, Phosphorin,Microbin + Mycorrhiza, Microbin + Phosphorin) and four levels of P-fertlization (in the form of calcium super phosphate) in the sub plots. The P-rates were 0, 50, 75, and 100% of recommended dose. The obtained results indicated that inoculation of seeds either alone or in combination with any of the P-levels especially 50% and 75 % increased yield and yield  components, crude protein, as well as the N, P, and K contents when compared to uninoculated plants. The highest significant values were observed under the treatment of (Microbin + Mycorrhiza) and (Microbin + Phosphorin). It could be  also indecated that biofertilization could play a significant role in converting the fixed form of phosphorus into an available form to plant uptake especially under calcareous soil conditions where P is fixed due to high pH and significant quantities of free excess lime.

Keywords

Journal of Soil Sciences and Agricultural Engineering
Volume 3, Issue 4
April 2012
Pages 471-482

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