大棚蔬菜缺肥诊断方法大棚蔬菜需肥量较大，若肥源不足，就会在植株上表现各种病症。缺乏氮肥：其最初显现部位主要在叶片上，即叶子呈淡绿色或黄色，茎秆不久也发生同样的变化，这种现象通常是从老叶片开始，最后整个植株变成淡黄色或褐色。缺乏磷肥：缺磷的症状多见于生... Greenhouse vegetable lack of fertilizer diagnosis method Greenhouse vegetables need more fertilizer, if the lack of fertilizer, it will show a variety of diseases on the plant. Lack of nitrogenous fertilizer: The initial spot on the leaves is mainly on the leaves, ie the leaves are light green or yellow, and the same happens to the stalks sooner rather than later. This is usually the case when the old leaves start, and finally the entire plant turns pale yellow or brown. Lack of phosphate fertilizer: phosphorus deficiency symptoms more common in health ...