A field experiment was carried out to study the effects of potassium fertilization and time of
harvesting on canola seed quality. The soil was a yellow-red latossol (sandy loam), and the experimental
design was a subplot replicated four times in completely randomized blocks. Potassium levels (0.0 and
40.0kg ha-1 of K) were applied in the plots, and the subplots were seven weekly harvests, starting 112 days
after planting. Seed quality was evaluated at each harvest and after six month of storage. The positive effect
of potassium fertilization on seed quality was more evident at six month of storage. The best seed quality
was obtained at 126 days after planting.