Potencial fisiológico de sementes de soja "CV.DOMINIO" em função do tamanho e do tempo de armazenamento

Abstract

The influence of soybean seeds size on physiological potential has been questioned. The study aimed to evaluate the effect of seed size on the physiological potential of soybean seeds “cv. Domain”, throughout storage. The experiment was conducted at the IFPI Agricultural Laboratory - Uruçuí Campus, under a completely randomized design with four replications and treatments arranged in a 2x4 factorial scheme, with two seed sizes (6.0 mm and 7.0 mm) and four periods. storage period: 0, 45, 90 and 135 days. Assessments were carried out immediately after harvest and every 45 days, using the following determinations: germination test (G); electrical conductivity (EC); accelerated aging test, followed by the sand germination test (EA); and the emergency field test (EMERG), with determination of the percentage and emergency speed index (IVE). In none of the variables studied did the seeds classified on the 6.0 mm and 7.0 mm sieves show a significant difference. While storage, despite not influencing germination, from 45 days onwards has a deleterious effect on seed vigor, as it promotes a reduction in percentage and IVE, increases the release of seed exudates, verified by the EC test and is drastic decreased germination after EA. Therefore, there is no difference in physiological potential between seeds of sizes 6.0 mm and 7 mm of cv. Domain. Storage for more than 45 days compromises vigor, regardless of seed size