在杂交水稻育秧中,除了常见的烂种、烂芽和死苗现象外,有时苗床中还会发生部分秧苗第二叶的叶尖卷卡于枯卷的第一叶内的现象,随着第二叶的伸长,其叶身弓起,从而形成“卡尖苗”。由于这第二叶长期弓曲不 In hybrid rice seedling, in addition to the common rotten, rotten buds and dead seedlings phenomenon, sometimes some of the seedlings will occur in the second leaf tip curled up in the first leaf of the phenomenon, with the first Two leaves of the elongation of its blade bow, thus forming a “card Jianmiao.” Because of this second leaf long bow song is not