大棚蔬菜如果肥量不足,就会在生长期间出现明显症状。现仅将缺氮、缺磷、缺钾、缺钙症状介绍如下;一、缺氮最初显现的部位在叶片上,叶片呈淡绿色或黄色,茎秆不久也发生同样的变化。这种现象是从老叶片开始,最后使整个植株变成淡黄色或褐色。二、缺磷多发生在生长初期。蔬菜缺磷时,生长缓慢,叶片呈现褪绿病斑,茎细长,富含木质,叶片较小,绿色往往比正常叶片较深。缺磷,许多蔬菜叶的背面呈红 Greenhouse vegetables if insufficient fat, there will be obvious symptoms during growth. Now only the nitrogen deficiency, phosphorus deficiency, potassium deficiency, calcium deficiency symptoms are described below; First, the site of nitrogen deficiency initially appeared on the leaves, the leaves were light green or yellow, the same stem soon after the same changes. This phenomenon starts with the old leaves and finally turns the entire plant into a light yellow or brown color. Second, lack of phosphorus occurred in the early stages of growth. Vegetables lack of phosphorus, the slow growth, leaf chlorotic lesions appear spots, stems slender, rich in wood, smaller leaves, green leaves tend to be deeper than normal leaves. Phosphorus deficiency, many vegetable leaves on the back was red