In the years 2008-2010 the effect of glyphosate used before harvesting of white mustard at a dose of 1.0 and 2.0 kg a.s.· ha^-1 on the value of its seeds was studied. Evaluation included: weight of one thousand seeds, uniformity, weight test, energy and germination capacity as well as the initial sprout growth. Also plant emergence from seeds planted at the depth of 2 and 4 cm was determined. The effect of glyphosate on physical parameters of seeds, as well as on germination capacity and emergence capacity depended on its dose. Applied at a dose of 2.0 kg a.s.· ha^-1 it decreased uniformity and the weight of one thousand seeds, and because of the decrease of germination capacity below 87% and emergence from depth of 2 cm, it prevents their utilization as a seed material. Decrease of emergence from greater depths as a result of application of even 1.0 kg of glyphosate per ha, decreases the risk of self-sown plants as relative weeds.

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