Tratamento químico, revestimento e armazenamento de sementes de Brachiaria brizantha cv. Marandu

Abstract

Despite the increasing use of coated seeds in recent years, there is little information available on the behavior of these seeds during storage. Therefore, the aim of this study was to evaluate the effect of different coating materials, in combination with chemical treatments, on seed performance during storage. Seeds of Brachiaria brizantha cv. Marandu provided by WolfSeeds were coated (pelleted) in an adapted concrete mixer using fourteen types of coating and were compared to uncoated control seeds. The combination of these treatments was also evaluated with fungicide and insecticide treatments of the seed. An evaluation was made of the physiological quality from the germination test, seedling emergence and sanitary quality after 0, 3, 6, 9 and 12 months of storage. It was concluded that seeds coated with Sand + PVA and sand + CaSiO3 + PVA or polymer, chemically treated, maintained physiological quality over the 12 months of storage; chemical treatment with the fungicide mixture Carbendazim + Thiram and the insecticide Fipronil on coated or non-coated seed gives effective control of fungi and promotes better physiological performance during storage; the coating with bentonite and/ or limestone negatively affected the seed quality of Brachiaria brizantha cv. Marandu during the 12 months storage period; the seed coating reduced the speed of germination and emergence of Brachiaria brizantha cv. Marandu.