以潮土、黄棕壤为供试土壤，选取小白菜、番茄分别为叶菜类、果菜类代表，在土培条件下研究了氮肥水平对蔬菜品质的影响，通过对蔬菜体内维生素Ｃ、可溶性糖、氨基酸总量及其组成、果实可滴定酸度、可溶性固形物含量、植株钙镁元素含量等营养品质指标及硝酸盐含量的分析表明，高氮使蔬菜营养品质下降，硝酸盐污染加剧。 Taking Chao soil and yellow brown soil as test soil, the Chinese cabbage and tomato were selected as representatives of leafy vegetables and fruits and vegetables. The effects of nitrogenous fertilizer on the quality of vegetables were studied under soil culture conditions. The effects of vitamin C, The analysis of nutritional quality index and nitrate content of sugar, total amino acid and its composition, titratable acidity of fruit, soluble solid content, content of Ca, Mg and other elements of plant showed that high nitrogen led to the decrease of vegetable nutrition quality and aggravation of nitrate pollution.