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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/10078

Title: Effect of VA Mycorrhiza and/or Bradyrhizobium Inoculants on Soybean Growth and Phosphatase Activity, Under Water Stress Conditions
Authors: A. M. Gomah
F. N. El-Barakah
A. M. Heggo
Issue Date: 1992
Abstract: A pot experiment was conducted to investigate the dual effect of inoculation with Bradyrhizobium, and VA mycorrhiza on soybean growth, nutrition and phosphatase activity of roots and soil. Effect of water stress was determined. The greatest increase in the percentage of shoot dry matter over the control treatments was recorded for, VA-mycorrhiza + rock-P (60.8%), VA-mycorrhiza + Bradyrhizobium + Rock-P (82.4%) and VA-mycorrhiza + Bradyrhizobium + SP (69.4%) treatments. Similar increases were found with roots. Also, VAM inoculation greatly increased nodulation; hence, the weight of nodules increased, on the average, from 0.66g plant-1 for Bradyrhizobium + Rock-P to 0.88, 0.78 and 1.16 g plant-1 for Bradyrhizobium +super-P, VAM+ Bradyrhizobium +RP and VAM Bradyrhizobium +SP treatments, respectively. Furthermore inoculation with VA - mycorrhiza and Bradyrhizobium increased phosphatase activity in roots and soil. The overall mean percentage increase of phosphatase over the control + RP or SP were 22.4, 30.0 and 37.3% in soybean roots treated with VAM+RP, VAM+ Bradyrhizobium +RP and VAM+ Bradyrhizobium + SP, respectively. A higher rate of increase in phosphatase activity was noticed in soil. Highest increase in nutrient uptake was recorded in soybean plants inoculated with both VAM and Bradyrhizobium fertilized with RP or SP. Water stress greatly reduced growth and nutrient content of' soybean plants. Phosphatase activity of roots and soil was also reduced by water stress. VA-mycorrhiza was found to stimulate Bradyrhizobium indicating that both contributed to the growth and nutrition of soybean.
URI: http://hdl.handle.net/123456789/10078
Appears in Collections:College of Foods And Agricultural Science

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