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大棚内由于连年种植蔬菜,致使棚内土壤营养元素不能满足蔬菜生长发育的需要,甚至影响蔬菜的产量和品质,造成减少。现将常见棚菜缺素症状及补救措施介绍如下。 1.缺氮 缺氮症状是植株矮小,叶色变淡或发红,基部叶片变黄;茎色也常有改变,发展很快,干燥后呈褐色、茎短而细。补救措施:发现缺氮时,应及时追施速效氮肥,如硝铵、硫铵、尿素等,但在棚内一般不用碳铵。 2.缺磷 植株生长缓慢,叶片变小但不失绿,甚至叶色变深,基杆变细
Due to the continuous cultivation of vegetables in the greenhouse, the nutrition elements in shed can not meet the needs of vegetable growth and development, and even affect the yield and quality of vegetables, resulting in a decrease. It is now common shed vegetables symptoms and remedies are described below. 1. Nitrogen deficiency and nitrogen deficiency is short plants, leaf color fades or redness, the base leaves turn yellow; stem color is also often change, the development of fast, brown after drying, stem short and thin. Remedy: Found nitrogen, it should be promptly pursued nitrogen fertilizer, such as ammonium nitrate, ammonium sulfate, urea, etc., but in the shed generally do not need ammonium bicarbonate. 2. Phosphorus deficiency plant growth is slow, the leaves become smaller but not lost green, and even darken the leaf color, the base rod becomes thinner