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Use of ammonium sulphate as a sulphur fertilizer: Implications for ammonia volatilization.

ABSTRACT: 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.

SUBMITTER: Powlson DS

PROVIDER: S-EPMC9290479 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Nitrogen fertilizer reduction in combination with <i>Azolla</i> cover for reducing ammonia volatilization and improving nitrogen use efficiency of rice.

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2019-12-31 | GSE112437 | GEO

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