夏型甘蓝型油菜的种植面积约占加拿大油菜总面积的50％,其余是夏型白菜型油菜。白菜型油菜的产量较低,含油量和蛋白质含量也较低。大量种植白菜型油菜的原因是,它成熟早。因为许多地区的无霜期平均只有110天或者更少,这就不得不种植白菜型油菜。这些地区的积温比那些无霜期长的地区还要低。积温低时,甘蓝型油菜需要115— Summer planting area of ​​Brassica napus accounts for about 50% of the total canola area, the rest is the summer cabbage rape. Cabbage rapeseed production is lower, oil content and protein content is also lower. The reason for planting a lot of cabbage rape is that it matures early. Because frost-free periods average only 110 days or less in many areas, it has to be planted with cabbage rape. The accumulated temperature in these areas is lower than in those areas where frost-free periods are long. Low accumulated temperature, Brassica napus requires 115-