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近年来,随着油菜产量水平的不断提高,倒伏已成为影响油菜高产的主要障碍。倒伏的油菜不仅产量比正常油菜低10—30%(严重的可达50%以上),而且经济品质差,含油量亦比正常油菜低10—20%。因此,防止倒伏是油菜栽培上一个不可忽视的课题。一、倒伏原因(一) 氮肥使用不合理施氮量过多、施肥方法不当,是造成油菜中后期茎叶徒长、引起倒伏的主要原因。据调查,亩施纯氮40斤的田块比亩施纯氮30斤的田块,倒伏率高20%,产量低10.5%;亩施纯氮
In recent years, as rapeseed production levels continue to rise, lodging has become a major obstacle to rapeseed yield. Lost rape not only yields 10-30% less than normal rapeseed (severe up to 50% or more), but also has poor economic quality and lower oil content by 10-20% than normal rapeseed. Therefore, to prevent the lodging is a rapeseed cultivation can not be ignored on the issue. First, the reasons for the lodging (A) unreasonable use of nitrogen Fertilizer excessive nitrogen, improper fertilization, is caused by stems and leaves in the late rape, leg stem, causing the main reason for lodging. According to the survey, 40 hectares of pure nitrogen Mushu plots of land than 30 kg of pure N fertilizer, lodging rate of 20%, 10.5% lower yield; Mushi nitrogen