玉米作物每公顷施氮达到 45 0～ 60 0 kg,氮利用率低 ,环境污染日趋严重 [1]。在尿素生产中 ,加入脲酶抑制剂——氢醌 ,制成长效尿素[2 ] ,减缓尿素水解进程 ,减少氮的损失 ,提高氮的利用率 ,达到增产节肥目的 ,现将长效尿素肥效试验介绍如下。1　材料方法试验设置在甘肃张掖地 Nitrogen per hectare of corn crop reaches 45 0 ~ 60 0 kg, nitrogen utilization rate is low and environmental pollution is more and more serious [1]. In urea production, adding urease inhibitor - hydroquinone, made of long-acting urea [2], slow down the process of urea hydrolysis, reduce nitrogen loss, improve nitrogen utilization, to achieve the purpose of increasing production of fertilizer, now long-term urea fertilizer Test described below. A material test method set in Zhangye in Gansu