一、缺氮:自老叶向新生叶逐渐黄化,叶片小;叶片干枯后呈浅褐色,生长缓慢,茎短而细;结球菜类不易结球或结球不良;根菜类根不膨大.补救措施:亩追施尿素7.5～10公斤或碳酸氢铵15～20公斤,也可采用0.5%～1%尿素稀释液或人粪尿150～200公斤加水进行叶面均匀喷施和浇施.二、缺磷:植株矮小,叶片小呈暗绿色,下部叶 First, nitrogen deficiency: from the old leaves to the new leaves gradually yellow, leaves small; leaf dry brown light, slow growth, short and thin stems; cotyledons is not easy to knot or bad ball; root vegetables are not swollen Remedial measures: Acrean topdressing 7.5 ~ 10 kg of urea or ammonium bicarbonate 15 ~ 20 kg, 0.5% ~ 1% urea dilution or 150 ~ 200 kg of human excrement can also be used for spraying and pouring water evenly on the foliage Second, lack of phosphorus: plant short, small dark green leaves, the lower leaves