蔬菜同其它作物一样,当缺少某种营养时,就会引起某种生理过程的失调,从而会在外部枝叶上表现出来.细心观察就看出缺肥症状,进行诊断适时施肥。氮:是植物的重要营养成分之一。氮肥不足,植株瘦小,叶绿体形成受到抑制,叶色由浓绿变为淡绿,甚至变黄,如黄瓜、豆角、茄子等。只有少数的蔬菜,如甘蓝缺氮时,呈桔红色,以至紫红色。瓜类缺氮时会出现开花到顶(蔓伸长缓 Vegetables, like other crops, cause some sort of physiological disorder when lacking certain nutrients, which can manifest themselves on the external branches and leaves. Careful observation shows the signs of lack of fertility and diagnoses and timely fertilizes them. Nitrogen: One of the important nutrients in plants. Inadequate nitrogen fertilizer, thin plants, chloroplasts inhibited, leaf color from thick green to light green, or even yellow, such as cucumber, beans, eggplant and so on. Only a small number of vegetables, such as cabbage nitrogen deficiency, was orange, and even purple. Melons will appear when the nitrogen deficiency flowering (creeping elongation slow