在播种时,由于覆土过薄,覆土过于疏松或过干,或覆土过晚,盖土层返墒过少,盖土缺少压力,细芽出土将种壳带出地面。由于种壳紧紧包住子叶,使子叶不能展开,影响子叶光合作用,对培育壮苗十分不利。防止“戴帽”出土,首先要克服害怕盖土厚番茄不出苗的 When sowing, due to overburden too thin, too loose or overburden soil, or cover too late, too little soil moisture back cover, lack of pressure on the cover soil, germination unearthed the seed shell out of the ground. Cotyledons tightly wrap the cotyledons, cotyledons can not be opened, affecting cotyledon photosynthesis, is very unfavorable to nurturing strong seedlings. To prevent the “hats” unearthed, we must first overcome the fear of over thick thick tomatoes do not emerge