贵阳市养牛村蔬菜基地土壤及蔬菜硝酸盐的研究

为了解贵阳市不同蔬菜硝酸盐的含量状况,对贵阳市养牛村无公害蔬菜生产基地应季15个蔬菜样品和13个土壤样品中的全氮和硝酸盐含量进行测定,结果表明：不同种类的蔬菜中硝酸盐的含量差别很大。检测的所有蔬菜样品中,叶菜类蔬菜硝酸盐的均值含量偏高,以绿星青菜硝酸盐含量最高,达到6960.8 mg/kg;土壤样品的全氮平均值为0.2107%,属于高肥力土壤;土壤样品的硝态氮平均含量为2309.52 mg/kg,较一般菜园土壤偏高;对于大多数蔬菜而言,土壤硝酸盐的含量是对蔬菜硝酸盐含量有较大影响;所测定的15个蔬菜样本中超过四级标准达到严重污染水平的占33.3%.

The Study on Nitrate Content in Vegetables and Soil in the Vegetable Base of Yangniu Village in Guiyang City

In order to know the nitrate content of different vegetables in Guiyang City,we particularly measured the nitrogen and nitrate content of 15 vegetables samples and 13 corresponding gardens soil samples,which were collected from the organic vegetable base of Yangniu village in Guiyang City in May 2006.The following results were obtained :Nitrate levels of different types of vegetables vary considerably.In all testing samples,leafy vegetables are of high levels of nitrates in the distance,with the highest con...