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Nitrogen transformations in and N 2 O emissions from soil amended with manure solids and nitrification inhibitor
Author(s) -
Zhu K.,
Bruun S.,
Jensen L. S.
Publication year - 2016
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/ejss.12385
Subject(s) - nitrification , chemistry , nitrous oxide , manure , nitrate , nitrogen , environmental chemistry , zoology , agronomy , environmental engineering , environmental science , organic chemistry , biology
Nitrification and nitrous oxide ( N 2 O ) emissions from soil can be suppressed effectively by the nitrification inhibitor dicyandiamide ( DCD ). However, there is currently a lack of in‐depth understanding about whether the effect produced by DCD is affected by the application of manure solids and about the mechanisms of the mitigation effect of DCD on N 2 O emissions. We applied the 15 N pool dilution technique in an incubation experiment to investigate the effect of DCD on nitrification processes and N 2 O emissions in soil amended with manure solids that were distributed either homogeneously or heterogeneously. The numerical model FLUAZ was used to calculate the gross nitrogen transformation rates from the 15 N trace results. The results showed that application of DCD effectively inhibited gross nitrification rates by 50–66% in soil amended with manure solids, but there were no significant effects on nitrate immobilization and remineralization rates. With large rates of nitrate consumption (7–11 mg N kg −1 soil day −1 ), we detected no significant effect of DCD on nitrification. In general, N 2 O emissions were about 50% less with the addition of DCD to the soil, even when nitrate consumption dominated. Furthermore, the spatial distribution of manure solids interacted with the inhibitory effects of DCD on nitrification and N 2 O emissions. Highlights Explored the effects of co‐application of DCD and manure solids on N transformations. Used the 15 N pool dilution technique to investigate effect of DCD on nitrification processes and N 2 O emissions. Application of DCD effectively and selectively inhibited gross nitrification rates and N 2 O emissions. The addition of DCD could be used to optimize application strategies of manure solids.