Physiological Quality of Soybean Seeds Subjected to Industrial Treatment Before and After Storage

This research work aimed to evaluate the physiological quality of soybean seeds subjected to different chemical treatments, before and after seed treatment, throughout conventional storage. A completely randomized design was adopted, with 4 replications, in which the treatments were arranged in a 2 × 7 × 6 factorial scheme (time of treatment (before and after) × industrial seed treatment (IST) × storage period (0, 15, 30, 45, 60 and 90 days). For each IST, the specific volume of slurry was 0, 700, 900, 1400, 900, 1100 and 1600 100 kg-1 of seeds, respectively. A total of 2.5 kg of seeds, cultivar BMX Alvo RR, were used. After being treated, the seeds were placed in kraft paper bags and stored at controlled temperature and humidity in a cold chamber. Their physiological quality was evaluated after each storage period using standard germination test, first germination count, emergence speed index, final emergence in sand substrate, accelerated aging, radicle length, shoot length, and whole seedling length. Their physiological quality was reduced in treatments with higher volumes of slurry. Deleterious effects on vigor were observed with increasing storage period, both before and after IST. After seed treatment, the mean of the analyzed variables was considered higher, compared to the time prior to seed treatment.