Ammonium sulphate is widely used as a sulphur (S) fertilizer, constituting about 50% of global S use. Within nitrogen (N) management, it is well known that ammonium-based fertilizers are subject to ammonia (NH₃) volatilization in soils with pH > 7, but this has been overlooked in decision making on S fertilization. We reviewed 41 publications reporting measurements of NH₃ loss from ammonium sulphate in 16 countries covering a wide range of soil types and climates. In field experiments, loss was mostly <5% of applied N in soils with pH (in water) <7.0. In soils with pH > 7.0, there was a wide range of losses (0%–66%), with many in the 20%–40% range and some indication of increased loss (ca. 5%–15%) in soils with pH 6.5–7.0. We estimate that replacing ammonium sulphate with a different form of S for arable crops could decrease NH₃ emissions from this source by 90%, even taking account of likely emissions from alternative fertilizers to replace the N, but chosen for low NH₃ emission. For every kt of ammonium sulphate replaced on soils of pH > 7.0 in temperate regions, NH₃ emission would decrease from 35.7 to 3.6 t NH₃. Other readily available sources of S include single superphosphate, potassium sulphate, magnesium sulphate, calcium sulphate dihydrate (gypsum), and polyhalite (Polysulphate). In view of the large areas of high pH soils globally, this change of S fertilizer selection would make a significant contribution to decreasing NH₃ emissions worldwide, contributing to necessary cuts to meet agreed ceilings under the Gothenburg Convention.

中文翻译：

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使用硫酸铵作为硫肥：对氨挥发的影响

硫酸铵被广泛用作硫 (S) 肥料，约占全球硫用量的 50%。在氮 (N) 管理中，众所周知，铵基肥料在 pH > 7 的土壤中会发生氨 (NH ₃ ) 挥发，但这在 S 施肥决策中被忽视了。我们审查了 41 篇报告 NH _{3测量值的出版物} 16 个国家的硫酸铵损失，涵盖各种土壤类型和气候。在田间试验中，在 pH 值（水中）<7.0 的土壤中，氮的损失大部分小于 5%。在 pH > 7.0 的土壤中，损失范围很广（0%–66%），其中许多在 20%–40% 范围内，一些迹象表明土壤中的损失增加（约 5%–15%） pH 值 6.5–7.0。我们估计，用不同形式的 S 替代可耕作作物的硫酸铵可以将该来源的 NH ₃排放量减少 90%，即使考虑到替代 N 替代肥料的可能排放，但选择低 NH ₃排放。在温带地区 pH > 7.0 的土壤中，每替换 1 kt 硫酸铵，NH ₃排放量将从 35.7 t NH 减少到 3.6 t NH₃ . 其他容易获得的 S 来源包括单一过磷酸钙、硫酸钾、硫酸镁、二水合硫酸钙（石膏）和杂卤石（多硫酸盐）。鉴于全球大面积的高 pH 值土壤，硫肥选择的这种变化将对减少全球 NH ₃排放做出重大贡献，有助于实现必要的削减，以满足哥德堡公约下商定的上限。