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Modeling nitrous oxide emissions from digestate and slurry applied to three agricultural soils in the United Kingdom: Fluxes and emission factors
2018
Shen, Jiacheng | Treu, Roland | Wang, Junye | Nicholson, Fiona | Bhogal, Anne | Thorman, Rachel
Organic fertilizers, such as digestates and manure, are increasingly applied in agricultural systems because of the benefits they provide in terms of plant nutrients and soil quality. However, there are few investigations of N₂O emissions following digestate application to agricultural soils using process-based models. In this study, we modified the UK-DNDC model to include digestate applications to soils by adding digestate properties to the model and considering the effect of organic fertilizer pH. Using the modified model, N₂O emissions were simulated from two organic fertilizers (digested food waste and livestock slurry) applied to three farms in the United Kingdom: one growing winter wheat at Wensum (WE) and two grasslands at Pwllpeiran (PW) and North Wyke (NW). The annual cumulative gross (i.e. not excluding control emission) N₂O emissions were calculated using MATLAB trapezoidal numerical integration. The relative errors of the modeled annual cumulative emissions to the measured emissions ranged from −5.4% to 48%. Two-factor models, including linear, exponential and hyperbola responses, correlating total N loading and soil clay content to calculations of N₂O emissions and N₂O emission factors (EFs) were developed for calculations of emission fluxes and EFs. The squares of the correlation coefficients of the measured and two-factor linear modeled emissions were 0.998 and 0.999 for digestate and slurry, respectively, and the corresponding squares of correlation coefficients of the EFs were 0.998 and 0.938. The two-factor linear model also predicted that the EFs increased linearly with decreasing clay content and the maximum EFs for digestate and slurry were 0.95 and 0.76% of total N applied, respectively. This demonstrates that the modified UK_DNDC is a good tool to simulate N₂O emission from digestate and slurry and to calculate UK EFs using TIER 3 methodology..
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1992
Marchaim, U. | Kostenberg, D. (Galillee Technological Center, Kiryat Shmona (Israel). Dept. of Biotechnology)
Decontamination and energetic supply in rural installations
1992
Carbonell, V. (Escuela Tecnica Superior de Ingenieros Agronomos, Madrid (Spain). Dept. de Fisica) | Bigeriego, M. | Delgado, M.
Combined anaerobic digestion of animal slurries and food industry liquid by-products
1992
Georgacakis, D. | Tsavdaris, A. (Agricultural Univ. of Athens (Greece). Dept. of Agricultural Engineering)
Preliminary investigation on the use of natural zeolites for pig slurry odor control
1992
Balsari, P. | Bertolotto, C. (Turin Univ. (Italy). Inst. of Agricultural Mechanics)
Treatment of animal wastes and uses of treated residues
1992
Hobson, P.N. (Aberdeen Univ. (United Kingdom). Dept. of Molecular and Cell Biology)
Common treatment of sewage sludge and animal waste slurries in covered digesters
1992
Linke, B. | Kolisch, G. (Essen Univ. (Germany). Inst. fuer Umwelttechnik)
[Measuring nitrate formation and nitrate transport in organically fertilized soil using the Time Domain Reflectometry (TDR)]
1995
Moeldrup, P. | Nissen, H.H. | Jensen, C.S. | Therkildsen, I.L. | Henriksen, K. (Aalborg Univ. (Denmark). Lab. for Miljoeteknik)
Risk of damage to crops in the direct neighbourhood of ammonia sources
1998
Eerden, L.J.M. van der | Visser, P.H.B. de | Dijk, C.J. van (Research Institute for Agrobiology and Soil Fertility, Research unit Plant and Biosphere, P.O. Box 14, 6700 AA Wageningen (Netherlands))
N-fluxes and efficiencies on farms in Styria, Austria
1998
Kuderna, M. | Blum, W.E.H. (Institute of Soil Science, University of Agricultural Sciences, Vienna (Austria))
