蔬菜肥害与对策在蔬菜生产中，肥害有以下两种类型。一、外伤型。（１）气体伤害，主要是氨气挥发于空气中引起。当氨气浓度在５ｐｐｍ以上时，植物叶片呈现水渍状斑，细胞失水死亡之后，留有枯死病斑；当浓度达４０ｐｐｍ时，则发生急性伤害，症状是：叶绿素被解体，叶内... Vegetable fertilizer damage and countermeasures In vegetable production, fertilizer has the following two types of fat. First, the trauma type. (1) gas damage, mainly caused by ammonia volatilization in the air. When the concentration of ammonia is above 5ppm, the leaves of plants show water-like spots, which leave dead spots after death from water loss. When the concentration reaches 40ppm, acute injury occurs when the chlorophyll is disintegrated and leaves inside. ..