在蔬菜育苗时,由于育苗技术水平所限,常常会出现一些“戴帽苗”和“高脚苗” 在种子出苗后种皮与子叶不脱,叫做“戴帽苗”。“戴帽苗”的子叶不能及时展开,影响光合作用,发育明显低于正常苗,原因是床土过干,覆土过薄所致。预防方法:1.浇足底水;2.覆土要适当加厚;3.播种后盖油纸或塑料薄 In vegetable nursery, due to the limited level of nursery skills, there are often some “wearing cap hats” and “high-grade sprouts”. Cotyledons can not be deployed in time, affecting the photosynthesis, which is obviously lower than that of normal seedlings. The reason is that bed soil is too dry and overburden is too thin. Preventive measures: 1. Pouring the foot of water; 2. Cover soil should be properly thickened; 3. After sowing cover oil paper or plastic sheet