蔬菜秧苗期由于床土配制比例不合适或床土中缺乏某种元素,秧苗会出现一些相应的症状。育苗管理上根据秧苗缺肥出现的症状,及时采取相应的施肥补救措施,可使秧苗迅速恢复正常生长,达到培育壮苗的目的。 1、缺氮症状 绝大多数蔬菜秧苗缺乏氮素或氮素不足时,秧苗生长衰弱,茎细,叶片小,两片子叶首先变黄,接着第一片真叶变黄,并继续向上发展,最后全株黄色和褐色,最后叶片枯死,死掉。针对这种症状及时追施氮肥,如尿素、硝酸铵 Vegetable seedling stage due to improper preparation of bed soil or bed of a lack of certain elements, seedlings will be some of the corresponding symptoms. Nursery management based on the symptoms of seedling deficiency, promptly take the appropriate fertilization remedial measures, seedlings can quickly restore normal growth, to cultivate the purpose of strong seedlings. 1, the nitrogen deficiency symptoms Most vegetable seedlings lack of nitrogen or nitrogen deficiency, seedlings grow weak, thin stems, leaves small, two cotyledons first yellow, then the first true leaves turn yellow and continue to move up, Finally the whole plant yellow and brown, the last leaves dead, died. In response to this symptom timely nitrogen fertilizer, such as urea, ammonium nitrate