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为找出一个适合叶菜类蔬菜无土栽培的营养液最佳配方 ,在日本园试配方的基础上 ,分别加入硝酸铵 5 5 6 ,83 3 ,111 1,138 9mg/L ,观察对小白菜生长及品质的影响。结果表明 :各处理提高了营养液的氮素水平 ,可促进小白菜的生长 ,产量增加 ,以加入硝酸铵 111 1mg/L处理效果最明显 ;当加入硝酸铵138 9mg/L时 ,增产幅度不再增大 ,并有下降趋势。但是随着营养液氮素水平的提高 ,小白菜硝酸盐的含量也明显提高 ,当加入硝酸铵 83 3mg/L时 ,硝酸盐含量已超过WHO/FAO规定的日摄取量允许值 (ADI值 )。采用在生长后期用清水更换营养液的方法 ,可明显降低小白菜硝酸盐的含量。
In order to find a best nutrient solution for soilless cultivation of leafy vegetables, based on the Japanese garden recipe, ammonium nitrate 556, 83 3, 111 1,138 9mg / L were respectively added to observe the effect on the growth of Chinese cabbage And the quality of the impact. The results showed that the treatments increased the nitrogen level of nutrient solution, promoted the growth of cabbage and increased the yield, and the treatment with 111 1 mg / L ammonium nitrate had the most obvious effect. When ammonium nitrate 138 9 mg / L was added, Increase again, and there is a downward trend. However, with the increase of N level in nutrient solution, the content of nitrate in pakchoi cabbage also increased obviously. When the ammonium nitrate 83 3mg / L was added, the nitrate content had exceeded the permissible value (ADI) of WHO / FAO, . The method of replacing the nutrient solution with water in the later stage of growth can obviously reduce the nitrate content of the Chinese cabbage.