Influence of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on ammonia-oxidizing bacteria and archaea in rhizosphere and bulk soil |
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Authors: | Kleineidam Kristina Košmrlj Kristina Kublik Susanne Palmer Iris Pfab Helena Ruser Reiner Fiedler Sabine Schloter Michael |
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Affiliation: | a Helmholtz Zentrum München, German Research Center for Environmental Health, Department of Terrestrial Ecogenetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany b University of Hohenheim, Department of Soil Science and Land Evaluation, Fruwirthstr. 12, 70599 Hohenheim, Germany c University of Hohenheim, Department of Plant Nutrition, Fruwirthstraße 14-16, 70599 Hohenheim, Germany d Forschungszentrum Jülich GmbH, Institute of Chemistry and Dynamics of the Geosphere (ICG-4), 52425 Jülich, Germany |
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Abstract: | In agricultural plant production nitrification inhibitors like 3,4-dimethylpyrazole phosphate (DMPP) are used to retard the microbial nitrification process of fertilized ammonium to enhance the nitrogen supply for cultivated crops and to reduce nitrogen losses from the production system. Besides the well-known ammonia-oxidizing bacteria (AOB) it is known for a few years that also ammonia-oxidizing archaea (AOA) are able to perform the first step in nitrification, hence being also a target for a nitrification inhibitor. However, so far no information are available concerning the effectiveness of DMPP and its extent towards AOB and AOA, neither in bulk soil nor in the root-rhizosphere complex. We investigated in a field experiment performed according to agricultural practice the effect of DMPP on the abundance of AOB and AOA two, four and eight weeks after fertilization. We observed impaired abundances of AOB but not of AOA in both soil compartments that were still visible eight weeks after application, possibly indicating a reduced effectiveness of the nitrification inhibitor in our study. |
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Keywords: | Nitrification inhibitor DMPP Ammonia-oxidizing bacteria Ammonia-oxidizing archaea Quantitative real-time PCR Arable soil |
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