Plantas de soja oriundas de sementes de alto e baixo vigor dentro de um mesmo lote

Abstract

The using of high quality seeds is extremely important to farmers, considering that vigor is one of the physiological attributes of quality and being the seeds of low vigor one of the possible factors responsible for the decline in productivity. The aim of this work was to evaluate the influence of seed vigor on vegetative and component yield aspects. The experiment consisted of a completely randomized experimental design, where each bucket containing soybean plants was considered one experimental unit, having 100 buckets for each vigor level. The vigor levels were high and low, being considered of high vigor the seeds that provided faster seedling emergence until the fifth day after sowing, and low vigor the seeds that provided later emergency, being included in this zone the ones that emerged after the sixth day. The yield components evaluated were: plant height, stem diameter, number of pods per plant, number of green pods per plant, number of seeds per plant and seed weight per plant. The results show that plants descendant from seeds of high vigor are more productive than plants from seeds of low vigor, within the same seed lot. The high vigor seeds originate plants population with less variation in vegetative and yield attributes, within the same lot of seeds and the number of pods per plant is the yield component responsible for the biggest production of high vigor seeds.