一要注意合理施肥。对城镇粪水作为肥源的菜地,由于多是采用水粪直接施入,不经过发酵腐熟的无害化处理,粪内含有多种寄生虫卵和传染病菌,易造成蔬菜沾污进而危害人体健康,因此不论是叶菜类还是果菜类蔬菜,在采收前30天内不要施用生粪水;对于长期施用化肥特别是单一使用氮肥的菜田,由于氮肥中的铵离子与空气接触后易转化成硝酸根离子,根系或 One should pay attention to rational fertilization. Due to the use of municipal manure as a source of fertilizers, water polluted water is often applied directly without being decomposed by fermenting and decomposing. The manure contains many kinds of parasite eggs and infectious diseases, which can easily cause vegetable contamination and thus harm Human health, so whether it is leafy vegetables or fruits and vegetables, do not apply raw sewage within 30 days before harvest; for long-term application of fertilizers, especially single use of nitrogen in vegetable fields, due to ammonium nitrogen in the fertilizer after exposure to air and easy Into nitrate ions, roots or