عنوان مقاله [English]
In order to investigate the effect of biochar and salicylic acid on phytoremediation of sorghum (Sorghum bicolor L.) to lead heavy metal (Pb), a factorial experiment was conducted in a completely randomized design with 4 replications in the greenhouse of Sari Agricultural Sciences and Natural Resources University in 2019. Treatments in five levels of lead (0, 400, 800, 1200 and 1600 mg Pb kg-1 soil), two levels of biochar (no-consumption and consumption of 20 g biochar kg-1soil) and two levels of salicylic acid (no-foliar application and 2 mM foliar application) were investigated and shoot and root dry weight, tolerance index, pb concentration in shoot, root and soil, transfer factor, bioaccumulation factor and Pb uptake in the shoot were measured. The results showed that the application of biochar and salicylic acid reduced the negative effect of lead on dry weight of sorghum and improved traits related to phytoremediation. The highest Pb concentration in shoot and root (671.17 and 398.70 mg Pb kg-1 dry matter, respectively) were obtained in the combined treatment use of biochar and salicylic acid at 1600 mg Pb kg-1 soil. Generally, the results showed that the use of biochar and salicylic acid in sorghum improves phytoextraction of Pb in contaminated soil.