The results showed that all the nitrification inhibitors could decrease nitrate contents in soils and in pakchoi during the whole growth periods and increase the yield of pakchoi to some extent.

• 结果表明，3种硝化抑制剂在试验的各个时期均不同程度地降低了土壤和小白菜硝酸盐含量，其中以双氰胺的效果最好。