蔬菜幼苗防“戴帽”在蔬菜育苗出土时，常常出现种皮夹住子叶而不脱落的现象，俗称“戴帽”。由于子叶被种皮夹住难以张开，使光合作用受到影响，导致幼苗生长不良，发育成弱苗。引起“戴帽”主要是种皮干燥所致。如播种时盖籽土太薄，或盖土太干燥，种皮容易变干；过早揭... Vegetable seedlings prevent “wearing hats” In the emergence of vegetable nursery, often appear seed clasp cotyledons without falling off phenomenon, commonly known as “wearing a hat.” As the cotyledons are hard to open the seed coat, causing photosynthesis is affected, leading to poor growth of seedlings, develop into weak seedlings. Caused by “wearing a hat” is mainly due to seed coat dry. Such as sowing seeds when the soil is too thin, or covering the soil is too dry, easy to dry the seed coat;