Document Type : Research Paper

Authors

1 Agronomy, Agricultural Sciences , Sari Agricultural Sciences and Natural Resources University, Sari, Iran

2 Department of Agronomy, Faculty of Crop Sciences, Sari Agricultural Science and Natural University, Sari.

3 Crop Plant Physiology Sari Agricultural Sciences and Natural Resources University

Abstract

In order to evaluate the ability of forage sorghum (Sorghum bicolor L.) to remediate the heavy metal cadmium with biochar and Pseudomonas putida, a factorial experiment based on completely randomized design accomplished in greenhouse conditions with four replications at Sari Agricultural Sciences and Natural Resources University, in the summer of 2019. The results showed that the presence of cadmium in the medium of sorghum reduced the dry weight of root and shoot. However, addition of biochar and bacterial inoculation significantly increased the mentioned traits. Bioconcentration factor and bioaccumulation factor increased from 25 to 100 mg of cadmium. Plant tolerance index had decreased with increasing cadmium concentration, while the use of biochar and inoculation of Pseudomonas putida had increased this index, when the highest tolerance index (1.22) was related to the treatment of combined use of biochar and bacteria with no cadmium, which increased by 22% compared to non-application of biochar and non-inoculation bacteria. As the tolerance index of forage sorghum in all concentrations of cadmium was higher than 0.60, so, this plant can be classified in the high tolerance group to the heavy metal cadmium stress and sorghum can be use for cadmium phytoremediation.

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