Abstract
The knowledge about the physical characteristics of seeds, whether coated or not, is essential for the design of machines and equipment. Therefore, the objective of this work was to determine the physical characteristics of colza (Brassica napus L.) seeds coated with bentonite, gypsum and kaolin, treated with fungicide (carboxin + thiram) and aqueous extract of black pepper (Piper nigrum L.). The untreated colza seeds were submitted to the coating process using bentonite, gypsum and kaolin as fillers, and as treatment products were used as fungicide (carboxin + thiram) and an aqueous extract of black pepper which were added to an aqueous solution of 30% PVA glue (cementing mixture). Then the physical characteristics were determined: diameter, number of times increased, porosity, angle of repose, resistance, classification in sieves and weight of one thousand seeds. The experiment was organized in a completely randomized design and arranged in a factorial scheme. The means, when necessary, were compared by the Scott-Knott test. The colza seeds coated with bentonite presented greater diameter, number of times increased, porosity, angle of repose and weight of a thousand seeds, followed by gypsum and kaolin. The treatment products had little influence on the physical characteristics of the coated seeds. Key words: Brassica napus L., diameter, resistance, weight of one thousand seeds.  
Highlights
The colza seed (Brassica napus L.), or its improved variety, the canola, (B. napus L. ssp. oleifera) is one of the main oilseeds in the world
It was noticed that the filling materials provided changes in the physical characteristics of the colza seeds, especially the bentonite, which stood out over the other materials, presenting higher values for the seed diameter, increasing on average 200% of the original diameter of the seeds
In view of the above, it can be concluded that: Colza seeds coated with bentonite present greater diameter, number of times increased, porosity, angle of repose and weight of one thousand seeds, followed by gypsum and kaolin
Summary
The colza seed (Brassica napus L.), or its improved variety, the canola, (B. napus L. ssp. oleifera) is one of the main oilseeds in the world. Oleifera) is one of the main oilseeds in the world. The colza seed (Brassica napus L.), or its improved variety, the canola, It has been used as green fodder for animal feed, fertilizer for soil conditioning and raw material for oil extraction, which has been used in human food, lighting, industrial use and more recently for the production of biofuel (Mori et al, 2014).
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