Dessecação pré-colheita na produção de sementes de trigo

Abstract

The objective of this study was to evaluate the physiological seed performance originated of wheat plants subjected to pre-harvest desiccation with different herbicides and seed moisture. The experimental design was randomized blocks in a factorial 4 x 3 (herbicides and no application x seed moisture) with four replications. The evaluations were mass of a thousand seeds, germination and first count, germination speed index, emergency and speed index of seedling emergence, accelerated aging and electrical conductivity of seeds. The pre-harvest desiccation in wheat plants, when performed in high humidity reduces the physiological quality of seeds. A use of herbicides for wheat plants in pre-harvest desiccation, over 30% of seed moisture, reduces the mass a thousand seeds. The vigor of the seeds produced is reduced by the action of herbicides applied in humidity of 40%, being dependent on the active ingredient. The germination and wheat seed vigor from plants subjected to herbicide application at different humidities of seeds have similarity when evaluated before sowing and after storage.