在保护地蔬菜生产中,许多农民朋友过于追求高产,在土壤养分含量已很高的情况下仍大量施肥,尤其是大量施用氮素化肥和人粪尿,从而引起氮素过剩症者越来越多。其症状一般表现为:瓜类植株徒长,易染病害。叶片肥大而浓绿,中下部叶片卷曲,叶柄稍微下垂,叶脉间凹凸不平,有明显斑点,叶缘处斑点结合在一起,稍后叶片变黄或褐色、萎蔫、果实较小,受害严重时,植株生长阻滞,几日内枯萎死亡。果类蔬菜,如西红柿表 In vegetable production in protected areas, many peasant friends are over-pursuing high-yielding crops and are still heavily fertilizing when the soil nutrient content is already high. In particular, large-scale application of nitrogenous fertilizers and human excrement can cause more and more nitrogenous sufferers many. The symptoms are generally manifested as: melons leggy, easy to dye diseases. Leaf hypertrophy and dark green, leaf curling in the lower part of the petiole slightly drooping, uneven between the veins, a clear spot, leaf edge at the spot together, later leaves turn yellow or brown, wilting, fruit smaller, severe damage, Plant growth retardation, wither death within a few days. Fruit vegetables, such as tomatoes