Physiological quality of soybean seeds submitted to chemical treatment and storage times

Treatment of early seeds, using new combinations of chemicals has been increasingly adopted, however, its effects on seed quality during storage are still not completely understood. The aim was to evaluate the physiological seed quality of two soybean cultivars treated with different combinations of chemical products during the storage period. The experiment was arranged in completely randomized with four replications in a factorial 7x5 design for each cultivar, with seven seed treatments and five evaluation periods (times) during storage (0, 60, 120, 180 and 240 days). The treatments were: 1) fipronil + pyraclostrobin + methyl thiophanate; 2) imidacloprid + thiodicarb + carbendazin + thiram; 3) abamectin + mefenoxam + fludioxonil + thiamethoxam + thiabendazole; 4) carbendazin + thiram; 5) fludioxonil + mefenoxam + thiabendazole; 6) carboxin + thiram and 7) control (no treatment). The physiological seed quality was evaluated by the following tests: germination, accelerated aging, seedling emergence in sand and shoot and root length of seedlings. The physiological quality of soybean seeds decreased during storage in all treatments (including the control). The treatment with the insecticides imidacloprid + thiodicarb associated with the fungicides carbendazin + thiram markedly reduces the physiological seed quality of the tested soybean cultivars.