QUALIDADE FISIOLÓGICA DE SEMENTES DE SOJA EM FUNÇÃO DO USO DE PROMOTOR DE ACÚMULO DE FOTOASSIMILADOS

Abstract

The seed sector faces several challenges in the seeds quality production, mainly in tropical and subtropical regions. The seeds physiological quality is directly linked to the field production form and from storage until delivery to the producer. The objective of this work was to evaluate the physiological quality of stored soybean seeds, treated or not with a photoassimilates accumulation promoter. The experiment was carried out part by field, on the Vale do Rio Verde farm - Santo Antônio de Goiás / GO, with two soybean cultivars (BMX Certa and BMX Power) treated or untreated (control) with photoassimilates accumulation promoter, which was applied at the R4 stage. Another part of this study was developed at the IF Goiano Seed Laboratory, Campus Rio Verde. For this, the seeds, after harvested, with and without treatment, were stored in a B.O.D (Biochemical Oxygen Demand) chamber, for a period of 6 months. The experiment was carried out in a completely randomized design, in a 2 x 3 factorial scheme (product use x storage times), with 4 replications of 50 seeds, in both cultivars. Germination, electrical conductivity test, hypochlorite test, emergency test, emergence speed index, seedling length and dry matter mass were evaluated at 0, 3 and 6 months of storage. The use of a photoassimilate accumulation promoter increases the seed vigor of the cultivar BMX Certa. The use of the photoassimilated accumulation promoter a higher emergence speed index and less electrical conductivity in seeds of the cultivar BMX Power.