一、肥料类型和种类 蔬菜产品中有毒物质的含量,特别是硝酸盐含量与所施用的肥料种类密切相关。化肥中的硝态氮可使蔬菜中硝酸盐含量大幅度提高,所以在无公害蔬菜生产中应限制使用化肥,特别是硝态氮肥,生产无公害蔬菜可供选择施用的肥料有: First, the type and type of fertilizer Toxic substances in vegetable products, especially the nitrate content is closely related to the type of fertilizer applied. Nitrate in fertilizers can greatly increase the nitrate content in vegetables, so the use of fertilizers, especially nitrate nitrogen fertilizer, should be restricted in the production of pollution-free vegetables. The fertilizers used for producing pollution-free vegetables are as follows: