Qualidade fisiológica de sementes de soja, submetidas à dessecação em pré colheita

Abstract

The economic importance of soybean (Glycine max L.) crops is evident as it is used for both human and animal feed. It has great sensitivity to environmental aspects such as temperature, photoperiod and water availability. Major changes in agriculture have been used to improve yields and mitigate risks such as increased investments and mechanization, the use of new and more productive cultivars, no-tillage, climate risk zoning, pest management, weed management, and crop integration. farming / livestock and forests. A very common practice that has been used is pre-harvest desiccation, where the anticipation of harvest allows obtaining seeds of better physiological and sanitary quality, as it avoids damage that may occur in the field, with excessive pre-harvest rainfall. and pest and microorganism attacks, justifying their efficacy evaluation in different soybean cultivars. The objective of this work is to evaluate the physiological quality of soybean seeds of cultivars NA5909 RG, BRS 5601RR, BMX Vanguard 6160RSF IPRO, BMX Elite 5855RSF IPRO, submitted to desiccant application in the preharvest phase, aiming to verify the efficiency of this practice. A completely randomized design was used, with eight treatments and three replications of each. Thousand grain weight, germination, vigor, green and dry mass of root and shoot and shoot length were evaluated. Significant results were obtained only in the weight of one thousand grains, where both desiccated cultivars presented higher weight in grams compared to the naturally mature ones.