一、幼苗“戴帽”出土症状:黄瓜幼苗出土后子叶上的种皮不能脱落,俗称“戴帽”(或带帽)。“戴帽”苗的子叶被种皮夹住不能及时正常伸开,甚至造成子叶损坏,影响子叶的光合作用,导致幼苗生长不良或形成弱苗。病因:1覆土太干致使种皮变干。2覆土过薄,土壤压力过小。3出苗后过早解开覆盖物或 First, seedlings “wearing a hat ” unearthed symptoms: cotyledons after cucumber seedling excavated on the seed coat can not fall off, commonly known as “wearing a cap ” (or with a cap). “Wearing a hat ” seedling cotyledon pinch can not be normal and timely extended, or even cause cotyledons damage, affecting cotyledon photosynthesis, leading to poor seedling growth or the formation of weak seedlings. Etiology: 1 soil is too dry cause the seed coat dry. 2 overburden too thin, soil pressure is too small. 3 Remove the cover prematurely or after emergence