The effect of row spacing and seeding rate on the yield of Brassica campestris L. and B. napus L. was studied for 2 yr in northwest Alberta. Rows were spaced 7.5, 15 and 23 cm apart with seeding rates of 7 and 14 kg/ha at each spacing. Decreasing row spacing from 23 cm to 15 cm and from 15 cm to 7.5 cm increased yields by an average 11% and 33%, respectively. Seeding rate had no significant effect on yield.
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Christensen et al. (1984) studied this question.