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Many factors affect the success of a canola crop.
The relative importance of each factor varies from year to year. There are growing seasons when drought and early frosts have the greatest effects on yields. In other years, there are significantly different yields between growers that can be attributed to management practices such as levels of fertilization, seeding practices, timing of swathing, etc. In many growing seasons, the same grower can grow a number of different varieties with very similar management and have noticeably different yields and feel it is the difference between varieties or attributable to a variety's genetics. Most years, it is not just one factor influencing the performance of the canola crop.