海北州是我省油菜主要产区,如门源县每年油菜种植面积约占总播种面积的30—40％;但由于多方面的限制因素,致使该地区油菜单产长期徘徊在100斤左右的水平,其中,比较突出的问题是,当地习惯于搞大播种量(大密度)的油菜生产。为此,我们设置该试验,为进一步探索甘蓝型油菜在该地区东部和其它暖区种植的合理密度及高产 Haibei Prefecture is the main producing area of ​​rape in our province. For example, the area of ​​rapeseed planted annually in Menyuan County accounts for 30-40% of the total sown area. Due to various restrictions, the yield of rapeseed in the area hovers around 100 jin Among them, the more prominent problem is that the locality accustomed to engage in seeding (large density) of rapeseed production. To this end, we set up the trial to further explore the rational density and high yield of Brassica napus grown in the eastern and other warm areas of the region