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蔬菜中含有大量的硝酸盐,据美国White报道,人体摄入的硝酸盐有81.2%来自蔬菜,而硝酸盐又是强致癌物亚硝胺的前体物,摄入量过多对人体健康有潜在的危害。因此控制蔬菜中硝酸盐含量具有非常重要的意义。一、合理科学施肥 (一)合理施用氮肥我国高产菜区过量施用氮肥是比较普遍而突出的问题。蔬菜中硝酸盐含量高低与氮肥施用量呈极显著正相关。因此应掌握合理的氮肥施用量、施用方式和施用时间,提高氮肥的利用率,降低蔬菜中硝酸盐含量,保证蔬菜质量。 (二)提高磷、钾肥的施用量氮肥施用过量,氮、磷、钾肥比例失调,导致氮肥流失,
Vegetables contain a lot of nitrate, according to the White reported by the United States, 81.2% of human intake of nitrate from vegetables, and nitrates is a precursor of carcinogenic nitrosamines, excessive intake of human health have Potential harm. Therefore, the control of nitrate in vegetables has a very important significance. First, rational and scientific fertilization (A) rational use of nitrogen fertilizer Over-application of nitrogen fertilizer in high-yielding areas of our country is a more common and prominent issue. The level of nitrate in vegetables was significantly and positively correlated with the amount of nitrogen fertilizer applied. Therefore, we should have a reasonable amount of nitrogen fertilizer application, application methods and application time to improve the utilization of nitrogen fertilizer to reduce nitrate content in vegetables to ensure the quality of vegetables. (B) to improve the application of phosphorus and potassium fertilizer overdose of nitrogen, nitrogen, phosphorus and potassium imbalance, resulting in nitrogen loss,