化肥对蔬菜硝酸盐含量的影响

鉴于人类食用过量的硝酸盐危及健康，为了寻求生产无公害蔬菜的科学依据，以生菜、莴苣、白苋菜、小白菜、大白菜等叶菜类蔬菜为材料，采用大田试验、盆栽试验和室内分析相结合的方法，研究了化肥对蔬菜硝酸盐含量的影响。结果表明，蔬菜施肥化学氮肥后易于富集硝酸盐，蔬菜体内硝酸盐含量依氮肥种类而异，且随着施氮量的增加而增加，施用磷钾肥及钼、锰、锌等微量元素肥料能够有效地降低蔬菜体内硝酸盐含量。

Effects of Chemical Fertilizer on Nitrate Content in Vegetables

This article is an attempt study the effect of fertilizer on nitrate content in vegetables by conducting, field and plot experiments on lettuce, amaranth and Chinese cabbage. The results show that nitrate is subject to accumulation in vegetables after fertilizer is applied in the field. Nitrate content in vegetables vary with different nitrogen fertilizers and increase with the raise of dosage of nitrogen. However, the results also reveal that the application of phosphorus, potassium, molybdenum, manganese and zinc will effectively decrease the nitrate content.