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幼苗出土后,种皮不脱落而夹住子叶的现象叫顶壳出土。番茄、茄子、辣椒、黄瓜、南瓜、西瓜、甜瓜等瓜菜的出苗期,容易发生这种现象。发生顶壳的幼苗,因子叶被种皮夹住,不能顺利展开,妨碍光合作用,使幼苗生长不良,成为弱苗。
After the seedlings were excavated, the phenomenon that the seed coat did not fall off but entrap cotyledons was called the top shell excavated. Tomato, eggplant, pepper, cucumber, pumpkin, watermelon, melon and other vegetables at the seedling stage, prone to this phenomenon. Occurrence of the top shell seedlings, factor cotyledon caught by the seed coat, can not be successfully developed, hindering photosynthesis, poor growth of seedlings, a weak seedlings.