油菜—棉花两熟栽培,是我省棉区采用的主要栽培制度,由于两季作物生育期都比较长,因此必须抢季节。一般均采用免耕法在前季作物间间栽或前季作物收后立即移栽,这样不仅缓和了季节矛盾,同时也减轻了劳动强度,提高了劳动工效。但免耕移栽的杂草问题很突出,特别是油菜收后田间的杂草密度一般较大,如不及时清除, Rape - cotton cultivation of two crops, cotton province is the main cultivation system used, as the two crops growing period is relatively long, it must seize the season. Tillage methods are generally used in the previous crop intercropping plants or crops collected immediately before the first transplanted, so not only ease the season of contradictions, but also reduce the labor intensity and improve labor efficiency. However, no-tillage transplanted weeds is very prominent, especially in rapeseed field after weed density generally larger, if not promptly removed,