and the use effect of mixture of AOL and urea is superior to urea treatment. Soil urease activity(SUA) test shows SUA of AOL treatment is lower than control,it is possible to use AOL as urease inhibitor.

• AOL与尿素配施处理的玉米生物量比单施尿素效果好，表明AOL对尿素有一定增效作用，对土壤脲酶活性的分析发现，施用AOL的土壤脲酶活性明显低于对照，说明AOL还可以作为脲酶抑制剂施用。