论文部分内容阅读
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78～188天,年降雨量155～501毫米,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11 000公顷以上。70至80年代,以“奥罗”、陇油一号、陇油二号为当地的主栽品种,这些品种曾对我县油菜生产水平的提高,发挥过一定的作用,但由于后来种性和综合性状退化,产量明显下降,
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 of 78 to 188 days, annual rainfall of 155 ~ 501 mm, the seasons are not obvious, no summer, is a cold and humid irrigation alpine cold farming area. Rape is the main cash crop planted by farmers in our county, with an annual sown area above 11,000 hectares. From the 70s to the 80s, “Oro”, Longyou 1 and Longyou 2 were the main cultivars. These cultivars had played a certain role in improving the rapeseed production level in our county. However, due to the later species And degenerative traits, the output decreased significantly,