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向日葵苗期生长快,发育早,要及时间苗、定苗。据观察,向日葵出现3～5对真叶时,即开始形成花盘的原始体,随着花盘原始体的形成,也就确定了小花数目。花盘原始体形成期间,若外界条件较好,则花盘内的小花数就会增多,花盘就大。否则,小花数目少,花盘小。因此,向日葵要早间苗、早定苗,为植株个体创造良好的环境条件,有利于向日葵高产。
Sunflower seedling fast growth, early development, and time to seedlings, Dingmiao. It is observed that when sunflowers appear 3 to 5 pairs of true leaves, that is, began to form the original body of the disk, with the formation of the original plate of the disk, it determines the number of florets. During the formation of the original disk, if the external conditions are good, the number of small flowers in the disk will increase, and the disk will be large. Otherwise, the number of small flowers, small faceplate. Therefore, the sunflower early seedlings, early seedlings for the individual plant to create a good environmental conditions, is conducive to high yield sunflowers.