عنوان مقاله [English]
In order to investigate the effect of bio-fertilizers on contamination rate of plants to heavy metals, a factorial experiment based on completly randomized design with three replications was carried out in greenhouse of soil science department at agriculture faculty of Zanjan University in 2015. The proposed treatments were: contamination levels of soil to cadmium (0, 10, 25, 50 and 100 mg of cadmium per Kg of soil) and inoculation with bio-fertilizers including; phosphate solubilizing bacteria Pseudomonas putida, mycorhiza fungi Funneliformis mosseae and Rhizophagus intraradices. The measured factors were leaf chlorophyll index, plant height, shoot and root fresh and dry weight, phosphorus and potassium of shoot and root and cadmium concentration in plant. The results indicated that the use of bio-fertilizers increased the leaf chlorophyll index, plant height, shoot and root fresh and dry weight, phosphorus and potassium of shoot and root significantly as compare to the control. The treatment of Funneliformis mosseae and Pseudomonas putida (M+P) could improve leaf chlorophyll index and plant height by 11.93 and 21.89 % in comparing whit control respectively. The chlorophyll index was significantly decreased by increasing cadmium levels in the soil. Simultaneous application of Funneliformis mosseae and Pseudomonas putida (M+P) and cadmium increased the shoot and root dry weight by 6 and 7 % as compared to treatment of 100 mg cadmium per Kg of soil. Totally, the results indicated that the inoculation of soil whit bio-fertilizers could reduce the harmful effects of cadmium on plants growth and yield.
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