Abstract: The effect of urease inhibitors, PPD, NBPT, HQ, were studied in laboratory and field on different soil under oxidized and reduced conditions, different temperature condition, and different rate of rice straw incorporated to soil. The effectiveness of PPD was the highest among 3 inhibitors, followed by NBPT. The rate of urea hydrolysis was found in the descending order of 35℃, 25℃, 45℃, 15℃. Rate of urea hydrolysis raised with increase of straw incorporated to soil, and approached to the maximum when the rate of rice straw at 3 mg/g soil. In a field experiment, the amendment of NBPT increase the recovery of Urea-N in rice plants and grain yield by 2.60%-7.52% and 5.70%-10.60% compared with the control, respectively.

Key words: Nitrogen efficiency, Oxidation-reduction status, Rice straw, Soil inoculation, Soil type, Temperature, Urease inhibitor

关键词: 氮肥效率, 温度, 脲酶抑制剂, 应用, 环境条件