油菜连年种植 ,会因土壤中钾与硼等营养元素的缺乏 ,引起“花而不实”等情况的发生 ,同时 ,菌核病、蚜虫及草害发生严重 ,造成油菜大幅度减产。因此 ,必须加强对连作油菜的田间管理。1　增施钾肥连作油菜田 ,特别是杂交稻茬油菜连作田应在油菜移栽成活 ,施第 1次壮苗肥后 1 0天 Rapeseed planted year after year, due to the lack of potassium and boron in the soil and other nutrients, causing “flowers and not real” and so on, at the same time, sclerotinia, aphids and grass damage serious, resulting in rapeseed production. Therefore, it is necessary to strengthen field management of continuous cropping rape. An increase of potash fertilizer even rapeseed field, especially hybrid rice crop Rape with crop should be rape transplanting survival Shi Shi 1 st strong seedling fertilizer after 10 days