论文部分内容阅读
油菜有两种高脚苗,一种是下胚轴过度伸长形成的高脚苗,一种是主茎节间伸长形成的高脚苗。这两种高脚苗对油菜生长发育和产量形成都极其不利。两种高脚苗形成的原因都是因为苗床播种量过大,间定苗不及时,或苗龄太长,群体矛盾大,迫使植株纵向生长所致。防止高脚苗的产生,首先必须扩大苗床面积,苗床与大田之比控制在1:6～8的范围内;其次是做到适时播种,使秧苗与大田茬口
Rape there are two kinds of tall seedlings, one is the hypocotyl elongation of the formation of high-footed seedlings, one is the main stem internodal elongation of the formation of tall seedlings. These two tall seedlings are extremely adverse to rape growth and yield formation. The reasons for the formation of the two high seedlings are because the seeding bed is too large, not between the scheduled seedlings, or seedling too long, large groups of conflicts, forcing the vertical growth of plants. To prevent the emergence of tall seedlings, we must first expand the seedbed area, seedbed and field ratio control in the range of 1: 6 ~ 8; followed by timely sowing, seedling and crop stubble