Desempenho de sementes salvas de soja com diferentes níveis de vigor

Abstract

Soybeans are the most widely cultivated crop in the world, where the use of seeds with physiological quality is fundamental for obtaining large productivities. Seed vigor is the main quality characteristic of a seed determining seed performance, and so that the greater the vigor, the better the development of the same. The objective of this study was to evaluate the performance of stored soybean seed lots under ideal conditions with different levels of vigor (very high, high, medium and low). The analyzes were carried out in the Laboratory of Seed Analysis of the UTFPR, Campus Pato Branco, where it was separated lots with different levels of vigor: very high (A), high (B), medium (C) and low (D), by means of accelerated aging which were stored for six months in ideal conditions. Posteriorly, evaluations were carried out of germination, aggregative aging, IVG, VG, shoot length and root, green mass and dry mass of shoot and root, field emergence and green mass and dry mass of seedlings.The data were analyzed by software R, where it was done Anova test (p<0,05), and when significant, means were compared by the Tukey test (p <0.05). The Pearson correlation test was also performed. The adequate storage of seeds resulted in maintenance of the physiological quality of the seeds. Different levels of vigor did not result in significant differences VG, shoot length and root, green and dry root mass and dry green mass of seedlings. However, the lots with higher levels of vigor (A and B) presented the highest results for the parameters germination, accelerated aging, VG, dry mass length and green mass of aerial part and emergence to field. In addition, field emergence correlated with all variables analyzed, except for VG and root dry mass. Thus, it is concluded that adequate storage is able to maintain seed vigor and that different levels of vigor affect shoot performance and seed development in the field but do not interfere with root development.