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利用室内氨挥发模拟系统和同位素 1 5 N示踪技术 ,研究高效尿素对氨挥发损失和氮素去向的影响。结果表明 ,与普通尿素相比 ,高效尿素在供试的 3种土壤中能推迟氨挥发开始时间和氨挥发高峰值出现的时间 ,降低氨挥发速率高峰值 ,减少氨挥发损失 1 8.9%～ 44 .1 %。高效尿素使水稻植株中来自肥料和土壤中的氮显著增多 ,当季氮素利用率增加 6 .3～ 7.1个百分点 ,土壤残留量增加 5 .3%～ 1 2 .0 % ,减少氮素损失 1 7.0 %～ 1 9.3%。施用高效尿素的水稻产量比施用等氮量普通尿素增产 2 7.0 %～ 2 9.3%。
The indoor ammonia volatilization simulation system and isotope 1 5 N tracing technique were used to study the effect of high-efficiency urea on ammonia volatilization and nitrogen removal. The results showed that compared with ordinary urea, high efficiency urea could delay the start of ammonia volatilization and the peak time of ammonia volatilization in the three soils tested, reducing the peak ammonia volatilization rate and reducing the ammonia volatilization loss by 8.99% .1 %. High-efficiency urea significantly increased nitrogen from fertilizers and soil in rice plants. Nitrogen utilization rate increased by 6.3 ~ 7.1 percentage points in this season and soil residue increased by 5.3% -1.2.0%, reducing nitrogen losses 1 7.0% ~ 1 9.3%. The yield of rice with high-efficiency urea increased by 7.07% -2.33% compared with that of common urea with nitrogen application.