油菜的每一个优良品种都是在一定的地区和一定的栽培制度下形成的。油菜的适应性虽较小麦、水稻等作物强,但它还是有一定的地区性,我省的自然条件复杂,各地、州、市、县的具体气候条件和栽培制度都不尽一样,甚至同一个县,不同公社、大队的气候条件与栽培制度也不相同,所以,油菜在调种或引种时要严加注意,减少或避免给油菜生产带来不必要的损失。油菜引种,首先要对引进的种子进行检疫,严防把新的病菌(指本地区原来没有的病菌)带入本地区,而造成新的病害。然后再进行引种鉴定,一般引种鉴定要经过两年以上观察、比较试验后才能大面积推广应用。为什么要这样做呢?因为不同品种,即使栽培在同一块土地上,也不可能获得完全 Each of the fine varieties of rape is formed under a certain area and a certain cultivation system. Although the adaptability of rape is stronger than the crops such as wheat and rice, it still has some regional characteristics. The natural conditions in our province are complicated. The specific climatic conditions and cultivation systems of different regions, prefectures, cities and counties are different, even with the same The climatic conditions and cultivation system of a county, commune and brigade are not the same. Therefore, when rape is planted or introduced, it is necessary to pay more attention to reduce or avoid unnecessary losses to rapeseed production. Introduction of rapeseed, the first of the quarantine of imported seeds, to prevent the new germs (that did not originally exist in the region) into the region, causing new diseases. Then the introduction of identification, the general introduction of identification to go through more than two years of observation, after a comparative test to promote the application of a large area. Why do this? Because different varieties, even cultivated in the same piece of land, it is impossible to obtain complete