Manejo da produção de sementes de soja e trigo em diferentes ambientes

Abstract

The present work comprises two experiments carried out between October 2017 and August 2018 to evaluate the effect of different glyphosate formulations on nodulation, agronomic performance, yield and seed quality of soybean in two sowing seasons, as well as to evaluate the quality of different wheat cultivars, aiming the correlation of the association of the physiological, physical and biochemical attributes of wheat cultivars. The application of the glyphosate formulations with the isopropylamine, Dimethylamine, potassium, ammonium, and without glyphosate salts were carried out in two vegetative stages sequentially for the sowing season of October and December, respectively. Characteristics of agronomic performance and seed yield per plant were evaluated. Germination and seed vigor were evaluated in the laboratory. The application of glyphosate showed influence on agronomic performance and yield, the sowing season of October showed a lower negative influence of glyphosates on the yield of seeds per soybean plant. The physiological quality of soybean seeds was not affected by the application of glyphosate salts, only the dimethyl amine salt influenced the size of seedlings. It was observed a difference in quality between wheat cultivars, germination and vigor of the seeds showed a positive correlation with the content of starch, fibers and ashes, as well as with the mass of one thousand seeds. There are differences between the effects of glyphosate salts, which may impair agronomic performance and yield, but does not affect seed viability. There is a positive correlation between the biochemical, physical and physiological attributes of wheat seeds, regardless of the cultivar and place of production.