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dc.contributor.authorVenterea, R. T.
dc.contributor.authorClough, Timothy J.
dc.contributor.authorCoulter, J. A.
dc.contributor.authorSouza, E. F. C.
dc.contributor.authorBreuillin-Sessoms, F.
dc.contributor.authorSpokas, K. A.
dc.contributor.authorSadowsky, M. J.
dc.contributor.authorGupta, S. K.
dc.contributor.authorBronson, K. F.
dc.date.accessioned2021-07-19T23:13:01Z
dc.date.available2021-06-23en
dc.date.issued2021-09
dc.date.submitted2021-06-14en
dc.identifier.issn0038-0717en
dc.identifier.urihttps://hdl.handle.net/10182/14037
dc.description.abstractDicyandiamide (DCD) is a nitrification inhibitor (NI) used to reduce reactive nitrogen (N) losses from soils. While commonly used, its effectiveness varies widely. Few studies have measured DCD and temperature effects on a complete set of soil N variables, including nitrite (NO₂¯) measured separately from nitrate (NO₃‾). Here the DCD reduction efficiencies (RE) for nine N availability metrics were quantified in two soils (a loam and silt loam) using aerobic laboratory microcosms at 5–30 °C. Both regression analysis and process modeling were used to characterize the responses. Four metrics accounted for NO₃‾ production and included total mobilized N, net nitrification, maximum nitrification rate, and cumulative NO₃‾ (cNO₃‾). The REs for these NO₃‾ -associated production variables decreased linearly with temperature, and in all cases were below 60% at temperatures ≥22 °C, except for cNO₃‾ in one soil. In contrast, REs for NO₂‾ and nitric oxide (NO) gas production were less sensitive to temperature, ranging from 80 to 99% at 22 °C and 50–95% at 30 °C. Addition of DCD suppressed nitrous oxide (N₂O) production in both soils by 20–80%, but increased ammonia volatilization by 36–210%. The time at which the maximum reduction efficiency occurred decreased exponentially with increasing temperature for most variables. The two-step nitrification process model (2SN) was modified to include competitive inhibition coupled to first-order DCD decomposition. Model versus data comparisons suggested that DCD had indirect effects on NO₂‾ kinetics that contributed to the greater suppression of NO₂‾ and NO relative to NO₃‾. This study also points to the need for NIs that are more stable under increased temperature. The methods used here could help to assess the efficacy and temperature sensitivity of other NIs as well as new microbial inhibitors that may be developeden
dc.format.extent11en
dc.languageenen
dc.language.isoen
dc.publisherElsevier
dc.relationThe original publication is available from - Elsevier - https://doi.org/10.1016/j.soilbio.2021.108341en
dc.relation.urihttps://doi.org/10.1016/j.soilbio.2021.108341en
dc.rights© 2021 Elsevier Ltd.
dc.subjectammoniaen
dc.subjectfertilizeren
dc.subjectnitrateen
dc.subjectnitrification inhibitoren
dc.subjectnitrous oxideen
dc.subjecturineen
dc.subjectAgronomy & Agricultureen
dc.titleTemperature alters dicyandiamide (DCD) efficacy for multiple reactive nitrogen species in urea-amended soils: Experiments and modelingen
dc.typeJournal Article
lu.contributor.unitLincoln University
lu.contributor.unitFaculty of Agriculture and Life Sciences
lu.contributor.unitDepartment of Soil and Physical Sciences
dc.identifier.doi10.1016/j.soilbio.2021.108341en
dc.relation.isPartOfSoil Biology and Biochemistryen
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/SOILS
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/QE18
pubs.publication-statusPublisheden
pubs.volume160en
lu.identifier.orcid0000-0002-5978-5274
pubs.article-number108341en


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