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Pedersen, J., Romio, C., Labouriau, R., Pacholski, A. S. & Hafner, S. D. (2023). Mitigating ammonia emission from slurry digestate applied to winter wheat crops: effect of digestate composition, digestate treatment, and application technique. Abstract from RAMIRAN, Cambridge, United Kingdom.

Pedersen, J., Hafner, S. D., Karlsson, V., Pacholski, A. S., Labouriau, R. & Kamp, J. N. (2023). Optimized design of flux chambers for online measurements of NH3 emission after field application of slurry with full-scale farm machinery. Abstract from EGU General Assembly 2023, Vienna, Austria. https://doi.org/10.5194/egusphere-egu23-12677

Smith, A. M., Sommer, S. G. & Taghizadeh-Toosi, A. (2023). Reduced Climate Impacts of Dairy Sludge Management by Introducing Hydrothermal Carbonization. Clean Energy and Sustainability, 1(1), Article 10003. https://doi.org/10.35534/ces.2023.10003

Sommer, S. G., Pedersen, J., Hafner, S. D. & Pacholski, A. S. (2023). Let's improve ammonia emission models for field-applied manure. Abstract from RAMIRAN, Cambridge, United Kingdom.

Støckler, A. H., Pedersen, J., Kamp, J. N., Feilberg, A. & Hafner, S. D. (2023). Effect of manure separation on ammonia emission during storage and subsequent field application. Abstract from EGU General Assembly 2023, Vienna, Austria. https://doi.org/10.5194/egusphere-egu23-12913

Dalby, F. R., Hafner, S. D., Petersen, S. O., Hansen, M. J., Adamsen, A. P. S. & Feilberg, A. (2022). The Anaerobic Biodegradation Model (ABM): A flexible tool for predicting methane emission from livestock manure. Poster session presented at Zero Greenhouse Emission in High Productive Agriculture, Hellerup, Denmark.

Dalby, F. R., Hafner, S. D., Petersen, S. O., Hansen, M. J., Adamsen, A. P. S. & Feilberg, A. (2022). The Anaerobic Biodegradation Model (ABM): A flexible tool for predicting methane emission from livestock manure. Abstract from 8th International Greenhouse Gas & Animal Agriculture Conference, Orlando, United States.

Hafner, S. D., Astals, S., Holliger, C., Koch, K., Nielsen, L., Refsahl, L. & Weinrich, S. (2022). Assessing the value of kinetic results from biochemical methane potential tests: Reproducibility from a large inter-laboratory study. Cleaner Chemical Engineering, 4, Article 100065. https://doi.org/10.1016/j.clce.2022.100065

Hafner, S. D. & Adamsen, A. P. S., (2022). Guidelines for selection of representative livestock barns and manure storages for measurement of greenhouse gas and ammonia emission for national inventories, No. 2021-0260400, 15 p., Nov 13, 2022. Advisory memorandum from DCA – Danish Centre for Food and Agriculture

Møller, H. B., Sørensen, P., Olesen, J. E., Petersen, S. O., Nyord, T. & Sommer, S. G. (2022). Agricultural Biogas Production—Climate and Environmental Impacts. Sustainability, 14(3), Article 1849. https://doi.org/10.3390/su14031849

Pedersen, J., Hafner, S. D. & Adamsen, A. P. S. (2022). Ammoniakreduktionseffekt ved forsuring og udbringning ved slæbesko af væskefraktion fra separeret afgasset husdyrgødning. DCA - Nationalt Center for Fødevarer og Jordbrug. Rådgivningsrapport fra DCA - Nationalt Center for Fødevarer og Jordbrug

Pedersen, J., Hafner, S. D. & Adamsen, A. P. S. (2022). Effectiveness of mechanical separation for reducing ammonia loss from field-applied slurry: Assessment through literature review and model calculations. Journal of Environmental Management, 323, Article 116196. https://doi.org/10.1016/j.jenvman.2022.116196

Pedersen, J., Hafner, S. D. & Adamsen, A. P. S. (2022). Vurdering af separation af flydende husdyrgødning som ny ammoniakreducerende udbringningsteknik. DCA - Nationalt Center for Fødevarer og Jordbrug. Rådgivningsrapport fra DCA - Nationalt Center for Fødevarer og Jordbrug

Sommer, S. G. & Hansen, M. N. (2022). Incorporation of deep litter reduce ammonia volatilization: Effect of incorporation depth and timing (Short Communication). Atmospheric Environment: X, 13, Article 100148. https://doi.org/10.1016/j.aeaoa.2022.100148

Sommer, S. G., Hafner, S. D., Laubach, J., van der Weerden, T. J., Leytem, A. B. & Pacholski, A. (2022). Model for calculating ammonia emission from stored animal liquid manure. Biosystems Engineering, 223(Part A), 41-55. https://doi.org/10.1016/j.biosystemseng.2022.08.007

Adamsen, A. P. S. & Hafner, S. D. (2021). Emissionsfaktorer for ammoniak fra ALFAM2 for afgasset biomasse.

Adamsen, A. P. S. & Hafner, S. D., (2021). Emissionsfaktorer for ammoniak fra ALFAM2 for ammoniakreducerende udbringningsteknikker, No. 2021-0294105, 8 p., Nov 17, 2021.

Adamsen, A. P. S., Nyord, T. & Hafner, S. D., (2021). The stability of pH of acidified stored manure slurry, No. 2021-0231465, 14 p., May 19, 2021.

Beltran, I., van der Weerden, T. J., Alfaro, M. A., Amon, B., de Klein, C. A. M., Grace, P., Hafner, S., Hassouna, M., Hutchings, N., Krol, D. J., Leytem, A. B., Noble, A., Salazar, F., Thorman, R. E. & Velthof, G. L. (2021). DATAMAN: A global database of nitrous oxide and ammonia emission factors for excreta deposited by livestock and land-applied manure. Journal of Environmental Quality, 50(2), 513-527. https://doi.org/10.1002/jeq2.20186

Dalby, F. R., Hafner, S. D., Petersen, S. O., Vanderzaag, A., Habtewold, J., Dunfield, K., Chantigny, M. H. & Sommer, S. G. (2021). A mechanistic model of methane emission from animal slurry with a focus on microbial groups. PLoS One, 16(6), Article 0252881. https://doi.org/10.1371/journal.pone.0252881

Dalby, F. R., Hafner, S. D., Petersen, S. O., VanderZaag, A. C., Habtewold, J., Dunfield, K., Chantigny, M. H. & Sommer, S. G. (2021). Understanding methane emission from stored animal manure: A review to guide model development. Journal of Environmental Quality, 50(4), 817-835. https://doi.org/10.1002/jeq2.20252

Hafner, S. D., Nyord, T., Sommer, S. G. & Adamsen, A. P. S. (2021). Estimation of Danish emission factors for ammonia from field-applied liquid manure for 1980 to 2019. DCA - Nationalt Center for Fødevarer og Jordbrug.

Holliger, C., Astals, S., de Laclos, H. F., Hafner, S. D., Koch, K. & Weinrich, S. (2021). Towards a standardization of biomethane potential tests: A commentary. Water Science and Technology, 83(1), 247-250. https://doi.org/10.2166/wst.2020.569

Hu, Y., Khomenko, O., Shi, W., Velasco-Sánchez, Á., Ashekuzzaman, S. M., Bennegadi-Laurent, N., Daly, K., Fenton, O., Healy, M., Leahy, J. J., Sørensen, P., Sommer, S. G., Taghizadeh-Toosi, A. & Trinsoutrot-Gattin, I. (2021). Systematic Review of Dairy Processing Sludge and Secondary STRUBIAS Products Used in Agriculture. Frontiers in Sustainable Food Systems, 5, Article 763020. https://doi.org/10.3389/fsufs.2021.763020

Mortensen, J. R., Ward, A. J., Weisbjerg, M. R., Hafner, S. D. & Møller, H. B. (2021). Determination of nitrogen and sulphur mineralization in batch and semi-continuous anaerobic digestion using an artificial fiber bag technique. Energies, 14(14), Article 4205. https://doi.org/10.3390/en14144205

Nyord, T., Hafner, S. D., Adamsen, A. P. S. & Sommer, S. G., (2021). Ammoniakfordampning fra forsuret gylle ved udbringning med slæbeslange, No. 2020-0188079, 18 p., Feb 15, 2021.

Olesen, J. E., Møller, H. B., Petersen, S. O., Sørensen, P., Nyord, T. & Sommer, S. G. (2021). Sustainable biogas - climate and environmental effects of biogas production. DCA - Nationalt Center for Fødevarer og Jordbrug. DCA rapport No. 181 https://dcapub.au.dk/djfpublikation/index.asp?action=show&id=1463

Pedersen, J. M., Andersson, K., Feilberg, A., Delin, S., Hafner, S. D. & Nyord, T. (2021). Effect of exposed surface area on ammonia emissions from untreated, separated, and digested cattle manure. Biosystems Engineering, 202, 66-78. https://doi.org/10.1016/j.biosystemseng.2020.12.005

Sommer, S. G. & Knudsen, L. (2021). Impact of Danish Livestock and Manure Management Regulations on Nitrogen Pollution, Crop Production, and Economy. Frontiers in Sustainability, 2, Article 658231. https://doi.org/10.3389/frsus.2021.658231

Sommer, S. G., Petersen, S. O., Winding, A., Olesen, J. E., Lund, P. & Munkholm, L. J. (2021, Nov). Teknologier til et klimaneutralt landbrug. JA Aktuelt. https://www.jaaktuelt.dk/artikler/2021/teknologier-til-et-klimaneutralt-landbrug/

Wagner, C., Nyord, T., Vestergaard, A. V., Hafner, S. D. & Pacholski, A. S. (2021). Acidification effects on in situ ammonia emissions and cereal yields depending on slurry type and application method. Agriculture (Switzerland), 11(11), Article 1053. https://doi.org/10.3390/agriculture11111053

Adamsen, A. P. S., Sommer, S. G., Feilberg, A. & Nyord, T., (2020). Forsuring af flydende husdyrgødning og afgasset biomasse ifbm. udbringning, No. 2020-0055171, 7 p., Aug 31, 2020.

Amodeo, C., Hafner, S. D., Franco, R. T., Benbelkacem, H., Moretti, P., Bayard, R. & Buffière, P. (2020). How Different are manometric, gravimetric, and automated volumetric BMP results? Water (Switzerland), 12(6), Article 1839. https://doi.org/10.3390/w12061839

Astals, S., Koch, K., Weinrich, S., Hafner, S. D., Tait, S. & Peces, M. (2020). Impact of storage conditions on the methanogenic activity of anaerobic digestion inocula. Water (Switzerland), 12(5), Article 1321. https://doi.org/10.3390/W12051321

Hafner, S. D., de Laclos, H. F., Koch, K. & Holliger, C. (2020). Improving inter-laboratory reproducibility in measurement of biochemical methane potential (BMP). Water (Switzerland), 12(6), Article 1752. https://doi.org/10.3390/w12061752

Hutchings, N. & Sommer, S. G., (2020). Vurdering af emissionsfaktorer ved ændret udbringningspraksis for urea og svovlsur ammoniak, No. 2020-0086461, 6 p., Jun 19, 2020.

Koch, K., Hafner, S. D., Astals, S. & Weinrich, S. (2020). Evaluation of common supermarket products as positive controls in biochemical methane potential (BMP) tests. Water (Switzerland), 12(5), Article 1223. https://doi.org/10.3390/W12051223

Koch, K., Hafner, S. D., Weinrich, S., Astals, S. & Holliger, C. (2020). Power and Limitations of Biochemical Methane Potential (BMP) Tests. Frontiers in Energy Research, 8, Article 63. https://doi.org/10.3389/fenrg.2020.00063

Lavrsen Kure, J., Krabben, J., Duelund, L., Vilms Pedersen, S. & Gjedde Sommer, S. (2020). Validation and comparison of ammonia measurement techniques used to determine ammonia absorbed by passive absorption samplers. Canadian Journal of Soil Science, 100(2), 175-178. https://doi.org/10.1139/cjss-2019-0124

Mikkelsen, M. H., Albrektsen, R., Hafner, S. D., Nyord, T. & Sommer, S. G., (2020). Konsekvensberegning for ammoniakemissionen fra udbringning af husdyrgødning, som følge af opdatering af data og emissionsfaktorer, 16 p., Fagligt notat fra DCE – Nationalt Center for Miljø og Energi (2020-...) Vol. 2020 No. 85 https://dce.au.dk/fileadmin/dce.au.dk/Udgivelser/Notatet_2020/N2020_85.pdf

Nikolajsen, M. T., Pacholski, A. S. & Sommer, S. G. (2020). Urea Ammonium Nitrate Solution Treated with Inhibitor Technology: Effects on Ammonia Emission Reduction, Wheat Yield, and Inorganic N in Soil. Agronomy, 10(2), Article 161. https://doi.org/10.3390/agronomy10020161

Olesen, J. E., Møller, H. B., Petersen, S. O., Sørensen, P., Nyord, T. & Sommer, S. G. (2020). Bæredygtig biogas - klima og miljøeffekter af biogasproduktion. DCA - Nationalt Center for Fødevarer og Jordbrug. DCA rapport No. 175 https://dcapub.au.dk/djfpublikation/index.asp?action=show&id=1454

Pedersen, J. M., Feilberg, A., Kamp, J. N., Hafner, S. & Nyord, T. (2020). Ammonia emission measurement with an online wind tunnel system for evaluation of manure application techniques. Atmospheric Environment, 230, Article 117562. https://doi.org/10.1016/j.atmosenv.2020.117562

Pedersen, S. V., Marti-Herrero, J., Singh, A. K., Sommer, S. G. & Hafner, S. D. (2020). Management and design of biogas digesters: A non-calibrated heat transfer model. Bioresource Technology, 296, Article 122264. https://doi.org/10.1016/j.biortech.2019.122264

Sommer, S. G., (2020). Emission af metan og lattergas fra dybstrøelse i stald og på lager, No. 2020-0048014, 12 p.

Sommer, S. G., (2020). Faglig vurdering af ansøgning fra Flex Fertilizer System ApS (FF) om dispensation fra krav om tilsætning af urease inhibitor til urea bladgødsknings produkt., No. 2020-0042538, 2 p., Jan 17, 2020.

Sommer, S. G., Nyord, T. & Møller, H. B., (2020). Fastsættelse af krav til prøvetagning på biogasanlæg, No. 2020-0042913, Feb 19, 2020.

Sommer, S. G., (2020). Levering på bestilling via forskningsbanken nr. 3.31 rådgivningsbistand til Miljøstyrelsen under Arbejdsprogram for ydelsesaftale AU planteproduktion 2020, No. 2020-0042538, 2 p., Jun 15, 2020.

Cao, Y., Wang, X., Bai, Z., Chadwick, D., Misselbrook, T., G. Sommer, S., Qin, W. & Ma, L. (2019). Mitigation of ammonia, nitrous oxide and methane emissions during solid waste composting with different additives: A meta-analysis. Journal of Cleaner Production, 235, 626-635. https://doi.org/10.1016/j.jclepro.2019.06.288

Hafner, S. D., Pacholski, A., Bittman, S., Carozzi, M., Chantigny, M., Génermont, S., Häni, C., Hansen, M. N., Huijsmans, J., Kupper, T., Misselbrook, T., Neftel, A., Nyord, T. & Sommer, S. G. (2019). A flexible semi-empirical model for estimating ammonia volatilization from field-applied slurry. Atmospheric Environment, 199, 474-484. https://doi.org/10.1016/j.atmosenv.2018.11.034

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Sasha D. Hafner