Fatemeh Delavarnia; Faezeh Zaefarian; roghayeh hasanpour; Hemmatollah Pirdashti
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 has been conducted based on completely randomized design accomplished in greenhouse conditions with four replications at Sari Agricultural ...
Read More
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 has been conducted 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. Results show that the presence of cadmium in the medium of sorghum reduce the dry weight of root and shoot. However, adding biochar and bacterial inoculation significantly increase the mentioned traits. Bioconcentration factor and bioaccumulation factor have increased from 25 to 100 mg of cadmium, when the highest shoot bioaccumulation factor (2.31) is observed at a concentration of 100 mg Cd per kg soil and in the simultaneous application of Biochar and Pseudomonas putida, which is a significant increase of 28.33% compared to the control. The lowest translocation factor of sorghum (1.000) is related to non-application of biochar, non-inoculation of Pseudomonas putida and without cadmium contamination, itslef reduced by 20% compared to the control, while the highest translocation factor (1.94) is observed at a concentration of 25 mg of cadmium per kg of soil and treatment of non-application of biochar and non-inoculation of Pseudomonas putida. Plant tolerance index has decreased by increasing cadmium concentration, while the use of biochar and inoculation of Pseudomonas putida has increased this index when the highest tolerance index (1.22) is related to the treatment of combined use of biochar and bacteria with no cadmium, 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 is more than 0.60, this plant can be classified in the highly-tolerant group to the heavy metal cadmium stress and sorghum could be used for cadmium phytoremediation.
Fereshteh Nourollahi; Hamid Mohammaddoust; Davood Hassanpanah; Mohammad Anvar
Abstract
In order to study the competitiveness of potato cultivars with weeds, an experiment was conducted in 2016 at field research of Ardabil Agriculture and Natural Resources Research Station. For this purpose a randomized complete block has been used with three replications. The treatments include ten potato ...
Read More
In order to study the competitiveness of potato cultivars with weeds, an experiment was conducted in 2016 at field research of Ardabil Agriculture and Natural Resources Research Station. For this purpose a randomized complete block has been used with three replications. The treatments include ten potato cultivars, grown with and without natural weed competition, with yield loss ranging from 3% in Satina to 84% in Agria in weedy condition. Also, the Competitive Ability (CA) of the cultivars differs. It is observed that satina cultivar has had the highest competitive index (CI) and could reduce the weed dry mass by two folds in comparison to Spirit as a poor cultivar. Also, stem diameter is seen to be negatively correlated with weed dry mass and positively correlated with tolerance and competition indices. Stem diameter in Satina has significantly stodd higher than Spirit cultivar. In general, the results of this study declare that Satina cultivar is considered as a tolerant and recommendable option for cultivation in Ardebil region than other cultivars, less susceptibility index (SSI) and more stable than weed, and can be introduced as a competitive cultivar in non-chemical weed management programs.