民乐县地处祁连山北麓,南部为丘陵草原区,北部为荒漠戈壁区,中间为洪积、冲积扇形平原农作区,年平均气温2～4℃,无霜期78～188d(天),年降雨量155～501mm,四季不明显,无夏季,属高寒阴湿冷凉灌溉农业区。油菜是我县农民种植的主要经济作物,年播种面积在1100hm~2以上。70至80年代,以“奥罗”、陇油1号、陇油2号为当地的主栽品种,这些品种曾对我县油菜生产水平 Minle County is located in the northern foot of the Qilian Mountains, the southern hilly grassland area, the northern desert Gobi area, the alluvial, alluvial fan plain farming area, the annual average temperature of 2 ~ 4 ℃, frost-free period 78 ~ 188d (days), annual rainfall The amount of 155 ~ 501mm, the seasons is not obvious, no summer, is a cold alpine cold wet irrigation agriculture. Rape is a major cash crop grown in our county farmers, the sown area of ​​1100hm ~ 2 or more. From the 70s to the 80s, “Oro”, Longyou 1 and Longyou 2 were the main varieties cultivated in our country.