一忌叶菜施硝铵。小白菜、大白菜、苋菜、空心菜、芹菜、菠菜等 ,生长期短 ,易吸收硝酸态氮肥。如施用硝酸铵 ,绿叶蔬菜吸收的都是硝酸盐类离子 ,长期食用 ,盐类进入人体 ,会引起累积中毒。二忌施尿素后浇水。尿素中所含氮成分为酰胺 ,酰胺态氮素在土壤微生物分泌的脲酶作用下 Avoid leafy vegetables ammonium nitrate. Chinese cabbage, Chinese cabbage, amaranth, spinach, celery, spinach, etc., short growth period, easy to absorb nitrate nitrogen fertilizer. Such as the use of ammonium nitrate, green leafy vegetables are absorbed nitrate ions, long-term consumption, salt into the body, can cause cumulative poisoning. Second, avoid urea watering. Nitrogen contained in urea is amide, amide nitrogen in urease secreted by soil microorganisms