Abstract
Seed yield, height, days to mature and oil content were measured on 16–25 lines of turnip rape (Brassica campestris L.) grown at both Beaverlodge and Saskatoon in the years 1970 through 1975. Dividing the total variation observed in each year into sources relating to genetic differences, genotype–location interaction and plot-to-plot error revealed that the last component accounted for most of the variation, particularly for yield, height and maturity. The phenotypic correlation of line mean performance between locations was significantly less than the heritability in only 5 of 20 cases at Beaverlodge and less than the heritability in none of the cases at Saskatoon. This suggests that selection at one location could be expected to give improvement at the other in most instances. Of the four traits, only height and maturity were correlated.
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