Qualidade fisiológica de sementes de soja produzidas sob aplicações de diferentes fungicidas

Abstract

Soybeans are the main Brazilian agricultural commodity and are widely distributed worldwide. During its cycle, many pathogens attack this crop and can cause losses of up to 100% if not controlled. One of the most used control methods is the chemical, where several active ingredients are available in the market. Therefore, it is important to study the reflection of these molecules and whether their origin interferes with the physiological quality of the seeds produced. An experiment was conducted in southern Brazil to verify the impact of these variables on seed quality. It was sown to the cultivar BMX Garra IPRO in randomized blocks with 4 replicates. Four applications of fungicides with different chemical groups were made: dithiocarbamate, triazole, strobilurin + carboxamide. These applications were scheduled and in different sequences. At the point of harvest, the plants were ripped apart and divided into three equal parts in relation to their maximum height. Seeds from these thirds were separated and exposed to the first germination (GPC), germination (G), thousand seed (PMS), accelerated aging (EA) and field emergence tests. The application of different active principles has different reflexes according to the thirds analyzed by the tests of first count of germination, germination and weight of thousand seeds. Two applications with triazoles and two with strobilurin + carboxamide alone did not reflect better vigor of soybean seeds than two applications with dithiocarbamates and two with triazoles.