Abstract
The applicability of 24-epibrassinolide for reducing phytotoxicity during combined treatments of soybean with thifensulfuron-methyl and imazamox was examined. Tests were conducted in three commercial soybean varieties (Valjevka, Galina and Galeb) on fields of the PKB Co. at Lepusnica and Glogonjski Rit over three vegetation seasons. Commercial products of thifensulfuron-methyl, imazamox and 24-epibrassinolide were used in the trials. The products were applied in combinations, using the recommended application rates at the soybean growth stage of third trifoliate. Phytotoxicity was assessed 14 and 30 days after treatment, and grain yield of each soybean variety was measured at the end of each vegetation season. The combination of thifensulfuron-methyl and imazamox was found to be toxic to soybean in all three seasons, and symptoms of phytotoxicity included: chlorosis and dark red venation of leaves, delayed development of young leaves, and stunted growth. Phytotoxicity was significantly lower in the fields treated with 24-epibrassinolide. Also, the combination of thifensulfuron-methyl, imazamox and 24-epibrassinolide was associated with higher soybean grain yield, compared to the combination of thifensulfuron-methyl and imazamox.
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