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近年来,油菜倒代已成为影响油菜高产优质的主要障碍。据调查和测定,倒伏的油菜不仅产量比正常油菜低10—20％,严重的达50％以上,而且品质差,出油率比正常油菜低10—30％。因此,防治倒伏是油菜栽培上的一项重要措施。一、油菜倒伏的原因 1、施氮量过多和施用方法不当。氮肥施用不合理是造成油菜中后期茎叶徒长,引起倒伏的主要原因。据中国农科院油料研究所分析,亩产100—150公斤菜籽的甘蓝型油菜,每生产100公斤菜籽(包括根、茎、叶、花、荚壳)需吸收氮9
In recent years, rapeseed has become a major obstacle to rapeseed yield and quality. According to the investigation and determination, the lodging of rape not only yields 10-20% lower than normal rapeseed, but also seriously affects the quality of rapeseed. The quality is poor, and the oil yield is 10-30% lower than that of normal rape. Therefore, the prevention and treatment lodging is an important measure on rapeseed cultivation. First, the reason rape lodging 1, excessive nitrogen fertilizer and improper application methods. Irrational application of nitrogen fertilizers is the main reason that caused stems and leaves to elongate in the late stage of rape and lead to lodging. According to the analysis by the Chinese Academy of Agricultural Sciences Oil Research Institute, 100-150 kilograms of rapeseed-yielding Brassica napus each need to produce 100 kg of rapeseed (including roots, stems, leaves, flowers, pods)