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用无土栽培法研究了氮、磷、钾对潍坊青萝卜硝酸盐含量的影响。结果表明:萝卜硝酸盐含量随着氮浓度的增大而提高,130mg/kg、230mg/kg和330mg/kg三个浓度间萝卜硝酸盐含量的差异极显著;磷不足或过量使用均能显著地提高萝卜的硝酸盐含量,磷浓度80mg/kg时的萝卜硝酸盐含量最低;萝卜硝酸盐含量随着钾浓度的增大而降低,140mg/kg和500mg/kg处理间的萝卜硝酸盐含量差异显著;氮、磷、钾配合施肥有利于降低萝卜的硝酸盐含量。根据生食蔬菜的硝酸盐含量低于432mg/kg的标准要求,潍坊青萝卜无土栽培中的氮、磷、钾适宜施肥浓度为:氮(N)<130mg/kg、磷(P2O5)80mg/kg左右、钾(K2O)320mg/kg左右。
The effects of nitrogen, phosphorus and potassium on the nitrate content of Weifang green radish were studied by soilless culture. The results showed that the nitrate content of radish increased with the increase of nitrogen concentration. The difference of nitrate content of radish among the three concentrations of 130mg / kg, 230mg / kg and 330mg / kg was extremely significant. The nitrate content of radish was the lowest when the phosphorus concentration was 80mg / kg. The nitrate content of radish decreased with the increase of potassium concentration. The difference of nitrate content of radish between 140mg / kg and 500mg / kg was significant Nitrogen, phosphorus and potassium fertilizers are helpful to reduce the nitrate content of radish. According to the standard requirement that the nitrate content of raw vegetables is less than 432mg / kg, the suitable nitrogen, phosphorus and potassium fertilization concentrations in the soilless culture of Weifang green radish are: nitrogen (N) <130mg / kg, phosphorus (P2O5) 80mg / kg About potassium (K2O) 320mg / kg or so.