Physiological response of colza (Brassica napus L.) seeds coated and treated with alternative materials

The coated seeds have multiple advantages in relation to the common seeds. In addition to the increase in size and uniformity in their shape, treatment products can be incorporated in them helping the germination process. Against the foregoing, the objective of this work was to evaluate the physiological quality of the colza (Brassica napus L.) seeds coated with bentonite, gypsum and kaolin and treated with fungicide (carboxin+thiram) and plant extract of black pepper (Piper nigrum L.). Colza seeds were encrusted with bentonite, gypsum and kaolin and received or not treatment with fungicide (carboxin + thiram) and aqueous extract of black pepper (Piper nigrum L.) which were added together with the cementing mixture (30% of glue of polyvinyl acetate). Germination was evaluated in three periods (4, 7 and 14 days after sowing). The experiment was organized in a completely randomized design and arranged in a factorial scheme (filling materials × treatment products). The means, when necessary, were compared by the Scott-Knott test (p ≤ 0.05). The seeds coated with gypsum presented the best results for germination and vigor, followed by kaolin and bentonite. The seed coating with gypsum + plant extract presents the same germination and vigor of the seeds without coating. Key words: Coating, bentonite, physiological response.