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Clays Can Decrease Gaseous Nutrient Losses from Soil‐Applied Livestock Manures
Author(s) -
Pratt Chris,
Redding Matthew,
Hill Jaye,
Brown Grant,
Westermann Maren
Publication year - 2016
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2015.11.0569
Subject(s) - greenhouse gas , manure , vermiculite , environmental science , nitrogen , nitrous oxide , nutrient , environmental chemistry , agronomy , chemistry , environmental engineering , materials science , ecology , organic chemistry , composite material , biology
Clays could underpin a viable agricultural greenhouse gas (GHG) abatement technology given their affinity for nitrogen and carbon compounds. We provide the first investigation into the efficacy of clays to decrease agricultural nitrogen GHG emissions (i.e., N 2 O and NH 3 ). Via laboratory experiments using an automated closed‐vessel analysis system, we tested the capacity of two clays (vermiculite and bentonite) to decrease N 2 O and NH 3 emissions and organic carbon losses from livestock manures (beef, pig, poultry, and egg layer) incorporated into an agricultural soil. Clay addition levels varied, with a maximum of 1:1 to manure (dry weight). Cumulative gas emissions were modeled using the biological logistic function, with 15 of 16 treatments successfully fitted ( P < 0.05) by this model. When assessing all of the manures together, NH 3 emissions were lower (×2) at the highest clay addition level compared with no clay addition, but this difference was not significant ( P = 0.17). Nitrous oxide emissions were significantly lower (×3; P < 0.05) at the highest clay addition level compared with no clay addition. When assessing manures individually, we observed generally decreasing trends in NH 3 and N 2 O emissions with increasing clay addition, albeit with widely varying statistical significance between manure types. Most of the treatments also showed strong evidence of increased C retention with increasing clay additions, with up to 10 times more carbon retained in treatments containing clay compared with treatments containing no clay. This preliminary assessment of the efficacy of clays to mitigate agricultural GHG emissions indicates strong promise. Core Ideas Technologies to mitigate agricultural GHG emissions are in demand. We tested the ability of clays to abate GHG emissions from soil + manure mixes. To our knowledge, this is the first study of its kind. The clays showed strong promise to decrease N emissions by as much as 90%. The clays also showed potential to boost C retention in soil + manure systems.