Desempenho de sementes de diferentes cultivares de soja tratadas e não tratadas armazenadas em diferentes condições

Abstract

In the process of soybean prodution it has been seeing an increase in prodution and produtivity and, each year, after harvesting, seeds are dry, processed and stored. However, fluctuation of climatic conditions in different country regions can accelerate seed deterioration and quickly reduce its vigour. Thus, it was performed this research aiming to assess seed performance among different soybean cultivars, treated and no treated, after the storage process in different conditions in a convetional warehouse in Alto Garças - MT. The work was carried out in a completely randomized design with for replicates, in 6x5x2 factorial scheme, which six cultivars (TMG 1176, TMG 1179, TMG 115, TMG 132, TMG 133 and GB 874, all of RR), 5 storage periods (0, 2 ,4, 6 and 8 months), and 2 storage environments (cold and dry chamber, 10ºC and 50% RH). Part of seeds in each cultivar was treated with CropStar (500 ml/100Kg of seeds) + Vitavax Thiram (200ml/100Kg of seeds) + water (300ml/100Kg of seeds). The seed quality was assessed through water content, germination, emergence, emergence speed index, cold test, rapid aging, electric conductivity, sanity test and isoenzymes. According to the results, the fungicide treatment did not cause any fitotoxic effect toward seeds in different soybean cultivars during storage period in both controlled and no controlled conditions. Seeds of different soybean cultivars have mantained high quality degree for around eight months in cold storage, and until around six months in no controlled storage conditions in Alto Graças - MT. Therefore, the seed sanity quality was maintained during the storage period regardless of warehouse conditions.