一、忌叶菜类施硝酸铵小白菜、大白菜、甘蓝、空心菜、芹菜、菠菜等叶菜类生长期短，易吸收硝酸态氨肥，所以如施用硝酸铵，绿叶蔬菜体内吸收积累的都是硝酸盐类离子，如长期食用硝酸盐类进入人体后会引发累积中毒。二、忌施尿素后浇水尿素中所含的氮成分为酰胺，酰胺态氮在土 First, to avoid leafy class ammonium nitrate application of Chinese cabbage, cabbage, cabbage, cabbage, celery, spinach and other leafy growth period is short, easy to absorb nitric acid ammonia fertilizer, so the use of ammonium nitrate, green leafy vegetables absorb the accumulation of all Nitrate ions, such as long-term consumption of nitrate into the human body will lead to cumulative poisoning. Second, avoid urea nitrogen water after urea contained in the composition of amide, amide nitrogen in the soil