Influence of key factors on ammonia and nitrous oxide emission factors for excreta deposited by livestock and land-applied manure

• DOI: 10.1016/j.scitotenv.2023.164066
• Publication Date: 2023-05-17T01:51:22Z
• Authors: T.J. van der Weerden; A.N. Noble; I. Beltran; N.J. Hutchings; R.E. Thorman; C.A.M. de Klein; B. Amon
• Keywords: Manure management

Ammonia (NH3) and nitrous oxide (N2O) emissions from livestock manure management have a significant impact on air quality climate change. There is an increasing urgency to improve our understanding of drivers influencing these emissions. We analysed the DATAMAN ("DATAbase for MANaging greenhouse gas ammonia factors") database identify key factors (i) NH3 emission (EFs) cattle swine applied land (ii) N2O EFs land, (iii) urine, dung sheep urine deposited during grazing. Slurry dry matter (DM) content, total ammoniacal nitrogen (TAN) concentration method application were slurry. Mixed effect models explained 14-59 % variance in EFs. Apart application, influence DM, TAN or pH suggests mitigation strategies should focus these. Identifying manures grazing was more challenging, likely because complexities associated with microbial processes soil physical properties impacting production Generally, soil-related e.g. water pH, clay suggesting mitigations may need consider conditions receiving environment spreading deposition. Total variability by terms mixed model average 66 %, random 'experiment identification number' explaining, average, 41 models. suspect this term captured non-measured manure, any biases measurement technique effects individual experiments. This analysis has helped inclusion within With studies over time, insights into underlying will be further improved.