Abstract Pasture-based livestock agriculture is a major source of greenhouse gas (GHG) nitrous oxide (N2O). Although a body of research is available on the effect of urine patch N or fertiliser N on N2O emissions, limited data is available on the effect of fertiliser N applied to patches of urinary N, which can cover up to a fifth of the yearly grazed area. This study investigated whether the sum of N2O emissions from urine and a range of N fertilisers, calcium ammonium nitrate (CAN) or urea ± urease inhibitor ± nitrification inhibitor, applied alone (disaggregated and re-aggregated) approximated the N2O emission of urine and fertiliser N applied together (aggregated). Application of fertiliser to urine patches did not significantly increase either the cumulative yearly N2O emissions or the N2O emission factor in comparison to urine and fertiliser applied separately with the emissions re-aggregated. However, there was a consistent trend for approximately 20% underestimation of N2O loss generated from fertiliser and urine applied separately when compared to figures generated when urine and fertiliser were applied together. N2O emission factors from fertilisers were 0.02%, 0.06%, 0.17% and 0.25% from urea ± dicyandiamide (DCD), urea + N-(n-butyl) thiophosphoric triamide (NBPT) + DCD, urea + NBPT and urea, respectively, while the emission factor for urine alone was 0.33%. Calcium ammonium nitrate and urea did not interact differently with urine even when the urea included DCD. N2O losses could be reduced by switching from CAN to urea-based fertilisers.

中文翻译：

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不同氮肥配方施用于草地尿斑对一氧化二氮排放的交互作用

摘要 基于牧场的畜牧业是温室气体 (GHG) 一氧化二氮 (N2O) 的主要来源。尽管有大量关于尿块 N 或肥料 N 对 N2O 排放的影响的研究，但关于肥料 N 施用于尿 N 块的影响的数据有限，可覆盖每年放牧面积的五分之一. 本研究调查了尿液和一系列氮肥、硝酸铵钙 (CAN) 或尿素 ± 脲酶抑制剂 ± 硝化抑制剂，单独施用（分解和重新聚合）的 N2O 排放总量是否接近尿液和肥料的 N2O 排放N 一起应用（聚合）。与分别施用尿液和肥料并重新汇总排放量相比，向尿液斑块施用肥料不会显着增加年累积 N2O 排放量或 N2O 排放因子。然而，与尿液和肥料一起施用时产生的数字相比，单独施用肥料和尿液产生的 N2O 损失有大约 20% 的低估趋势。来自肥料的 N2O 排放因子分别为 0.02%、0.06%、0.17% 和 0.25%，来自尿素 ± 双氰胺 (DCD)、尿素 + N-(正丁基) 硫代磷酰胺 (NBPT) + DCD、尿素 + NBPT 和尿素，而仅尿液的排放因子为 0.33%。即使尿素包含 DCD，硝酸铵钙和尿素与尿液的相互作用也没有差异。