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甘蓝型油交由于缺硼，虫害、病害严重。缺轩及后期偏施氮肥，容易发生“背生花”现象，造成油菜生育不协调、结荚少，严重影响产量。防止甘蓝型油菜“背生花”，应把握好“二关”：一、抓好病虫防治关大田期要经常检查虫情。特别是蚜虫。发现虫情要及时施药防治。3月中下旬至4
Due to lack of boron oil supply, pests, serious disease. Lack of Xuan and late partial nitrogen fertilizer, prone to “back flowering” phenomenon, resulting in rape reproductive uncoordinated, less pods, seriously affecting the yield. To prevent the Brassica napus “blooming flower”, should take a good “second off”: First, do a good job in pest control off the field to regular inspection of insects. Especially aphids. Insects should be detected timely application of pesticide control. In late March to 4