Qualidade fisiológica de sementes de soja submetidas à dessecação química

Abstract

Soybean crop is the most important agricultural commodities of Brazilian agribusiness, being widely used human and animal nutrition. It is one of the main export products and the economic importance of this crop boosted the professionalization of sectors. In this context, the use of high quality seeds will be directly responsible for obtaining satisfactory levels of productivity from cultivation. In some regions and in some years it is necessary to manage the crop in order to check out the timing of harvest because desiccation is a pre harvest technique used. Therefore, the study aims to evaluate the effect of using desiccants applied to R7 on the germination and soybean vigor. The study was performed in the experimental area, located in the city of Passo Fundo, Rio Grande do Sul. Seeds were sown in experimental design in scheme of split lots using four soybean cultivars (FPS Jupiter RR, Parapanema RR, FPS Tordilha RR, and FPS Urano RR), managed according to technical recommendations for soybean crop. At R7 stage in sub plot was applied different managements of desiccation (without desiccation, Finale, Paraquat and Diquat). Seeds were harvested using a plot harvesting machine and thousand seeds and germination and accelerated aging were evaluated, these two last assessed immediately after cultivation and also six months after harvest. After analysis of data it was concluded that the desiccation of soybean crops at R7 growth stage does not affect the seeds physiological quality. Diquat Paraquat and Finale herbicides can be used for desiccation of soybean crops.