Mitigation of nitrous oxide emissions in grazing systems through nitrifcation inhibitors: a meta‑analysis

A - Papers appearing in refereed journals

Soares, J. R., Souza, B. R., Mazzetto, A. M., Galdos, M. V., Chadwick, D. R., Campbell, E. E., Jaiswal, D., Oliveira, J. C., Monteiro, L. A., Vianna, M. S., Lamparelli, R. A. C., Figueiredo, G. K. D. A., Sheehan, J. J. and Lynd, L. R. 2023. Mitigation of nitrous oxide emissions in grazing systems through nitrifcation inhibitors: a meta‑analysis. Nutrient Cycling in Agroecosystems. 125, pp. 359-377. https://doi.org/10.1007/s10705-022-10256-8

AuthorsSoares, J. R., Souza, B. R., Mazzetto, A. M., Galdos, M. V., Chadwick, D. R., Campbell, E. E., Jaiswal, D., Oliveira, J. C., Monteiro, L. A., Vianna, M. S., Lamparelli, R. A. C., Figueiredo, G. K. D. A., Sheehan, J. J. and Lynd, L. R.
Abstract

Grasslands are the largest contributor of nitrous oxide (N2O) emissions in the agriculture sector due to livestock excreta and nitrogen fertilizers applied to the soil. Nitrification inhibitors (NIs) added to N input have reduced N2O emissions, but can show a range of efficiencies depending on climate, soil, and management conditions. A meta-analysis study was
conducted to investigate the factors that influence
the efficiency of NIs added to fertilizer and excreta
in reducing N2O emissions, focused on grazing systems. Data from peer-reviewed studies comprising 2164 N2O emission factors (EFs) of N inputs with and without NIs addition were compared. The N2O EFs varied according to N source (0.0001–8.25%). Overall, NIs reduced the N2O EF from N addition
by 56.6% (51.1–61.5%), with no difference between
NI types (Dicyandiamide—DCD; 3,4-Dimethylpyrazole phosphate—DMPP; and Nitrapyrin) or N source (urine, dung, slurry, and fertilizer). The NIs were more efficient in situations of high N2O emissions compared with low; the reduction was 66.0% when EF>1.5% of N applied compared with 51.9% when EF≤0.5%. DCD was more efficient when applied at rates>10 kg ha−1. NIs were less efficient in urine with lower N content (≤7 g kg−1). NI efficiency was negatively correlated with soil bulk density, and positively correlated with soil moisture and temperature. Better understanding and management of NIs can
optimize N2O mitigation in grazing systems, e.g., by
mapping N2O risk and applying NI at variable rate,
contributing to improved livestock sustainability

KeywordsAir pollution; Greenhouse gases; Grassland; Pasture; Manure; Enhanced-efficiency fertilizers
Year of Publication2023
JournalNutrient Cycling in Agroecosystems
Journal citation125, pp. 359-377
Digital Object Identifier (DOI)https://doi.org/10.1007/s10705-022-10256-8
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeBB/N013201/1
Publisher's version
Output statusPublished
Publication dates
Online28 Jan 2023
Publication process dates
Accepted09 Dec 2022
PublisherSpringer
ISSN1385-1314

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