肥害主要原因是偏施和过量施用化肥,使土壤产生盐渍化,从而抑制了蔬菜根系发育,削弱了对水、肥吸收的功能;由于土壤溶液浓度过大,蔬菜植株体发生反渗透现象,导致生理萎蔫或者叶缘枯焦;产生有毒气体危害,并引发蔬菜缺素症。药害有显性药害与隐性药害。原因在于一是选用农药品种不对路或者误用了除草剂;二是施药浓度 Fertilizer is mainly due to partial fertilization and excessive application of fertilizers, so that the soil salinization, thereby inhibiting the root development of vegetables, weakened the water and fertilizer absorption function; due to the concentration of soil solution, vegetable plants reverse osmosis , Resulting in physiological wilting or leaf margin Kujiao; produce toxic gas hazards, and trigger vegetable deficiency syndrome. Drug injury has obvious injury and hidden injury. The reason is that one is not the choice of pesticide varieties or misuse of herbicides; Second, the drug concentration