在我国,油菜是继稻、麦、玉米、大豆之后的第五大作物。菜油占我国食用油的55％,因此在国民经济中占有重要地位。 50年代至70年代,我国油菜栽培面积不超过250万公顷,单产只400-700公斤/公顷,而且长期徘徊不前。80年代,我国油菜栽培面积和单产迅速发展,全国栽培面积为350-500万公顷,単产在1100-1200公斤/分顷。90年代以来,我国油菜面积、单产发展到一个新的水平,面积达600-700 In our country, rape is the fifth largest crop after rice, wheat, corn and soybean. Vegetable oil accounts for 55% of China’s cooking oil, so occupy an important position in the national economy. From the 1950s to the 1970s, the area of ​​rapeseed cultivation in our country did not exceed 2.5 million hectares and the yield per head was only 400-700 kg / ha, which has remained stagnant for a long time. In the 1980s, the area and yield of rapeseed cultivation in our country developed rapidly. The national cultivated area was 3.5-5 million hectares with a yield of 1100-1200 kg / ha. Since the 90s, our rapeseed area, yield to a new level, an area of ​​600-700