Quality of sunflower seeds in function of thickness classification and sowing under speed variation of the seeder-fertilizer

The objective was to evaluate the quality of sunflower seeds classified according their thickness and passed through seeder-fertilizer dosing system under variation travel speed. A lot M734 by passing a set oblong-hole sieves two thicknesses were selected. portion with only commercial classification also reserved, named as non-classified. biometric evaluation done sowing carried out at 5.0, 6.5, 8.0, 9.5 11.0 km h-1. evaluated through: germination first count, average time percentage emergence in sand, accelerated aging tetrazolium test. reduce coefficient length, width, thickness, mass but does not affect seed vigor viability after speed variation. In higher studied speed, passage mechanism reduces germination. is affected 6.5 h-1 According sand test, seeds.