Incidência de danos mecânicos e qualidade fisiológica de sementes de soja

Abstract

Mechanical damage in soybean seeds can produce immediate or latent effects which greatly contribute to the reduction of the physiological quality of the lot. The main mechanical damage causes are the inadequate seed moisture at harvest, the aconditioning operations at this stage and post-harvest, including transportation, drying, processing, treatment and other. In addition, we have the characteristic own seed, with thin seed coat, leaving the embryonic axis substantially exposed. This study aimed to evaluate the physiological quality of soybean seeds during storage, with different mechanical damage levels. The study was conducted in company Serra Bonita using Seeds of the cultivar Syn 1080 RR. Were used two lots of the same variety, with three different levels of mechanical damage (2, 5 and 11%) combined with two evaluation periods, the first at the INITIOL the processing and the second 96 days after the beginning of storage. It evaluated germination viability by the tetrazolium test and emergency sand. The design was completely randomized with four replications performed statistics for each determination. The results show that the mechanical damage Contributes to greater reduction of the physiological quality of soybean seeds. The latent damage intensify the reduction of the physiological quality of soybean seeds elapsed 96 days after processing.