氮肥增效剂是一类对硝化细菌有毒的有机化合物。加入铵态氮肥中以抑制土壤内亚硝酸细菌对铵态氮的硝化，从而减少铵态氮转化为硝态氮而流失所用的添加剂。它们能够选择性地抑制土壤中硝化细菌的活动，从而阻缓土壤中铵态氮转化为硝态氮的反应速度。
同时可以看出氮肥增效剂能提高尿素利用率。
Therefore, nitrogen synergists could improve urea utilization rate.
以甘薯为材料，采用裂区设计探索了氮肥增效剂在南方热带地区的应用效果。
The experimentation takes sweet potato stem rot for example, using split plot design for exploring the implication effect of nitrogen adjuvant in south china tropic areas.
在大田小区试验条件下，研究了复合氮肥增效剂对玉米生长、产量和尿素氮利用的影响。
A field experiment was conducted to study the effects of 4 compound nitrogen fertilizer synergists on the growth and yield of maize and urea-N utilization by it.
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