Qualidade de sementes de cultivares de soja (Glycine max) para produção orgânica

Abstract

Seed quality is one of the challenges faced by organic farmers in different cropping systems. The objective of this work was to evaluate the seed quality of three soybean varieties cultivated in organic systems: BRS 284, Spring and Vmax. Germination, physiological quality and emergency were evaluated. The experiments were conducted in laboratories and greenhouses using a completely randomized experimental design. In the germination and emergence test, four replicates of 50 seeds were used and in the tetrazolium test two replicates of 50 seeds were used. The percentages of germination did not differ among cultivars, however, there were differences in the rate of germination and percentage of normal seedlings, with cultivar BRS 284 presenting the highest values. Seeds of Spring cultivar presented higher number of mechanical damages, while seeds of BRS 284 showed the highest number of bug and humidity damages. There was no difference between the cultivars in the tetrazolium tests and the Spring cultivar presented the best results related to emergence in comparison to the other cultivars.