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Effect of the nitrification inhibitor DMPP on nitrous oxide emissions and the stabilization of ammonium following the injection of dairy slurry and digestate in a soil-column experiment

  • Injection of slurry or digestate below maize seeds is a relatively new technique developed to improve nitrogen use efficiency. However, this practice has the major drawback of increasing nitrous oxide (N2O) emissions. The application of a nitrification inhibitor (NI) is an effective method to reduce these emissions. To evaluate the effect of the NI 3,4‐dimethypyrazole phosphate (DMPP) on N2O emissions and the stabilization of ammonium, a two‐factorial soil‐column experiment was conducted. PVC pipes (20 cm diameter and 30 cm length) were used as incubation vessels for the soil‐columns. The trial consisted of four treatments in a randomized block design with four replications: slurry injection, slurry injection + DMPP, digestate injection, and digestate injection + DMPP. During the 47‐day incubation period, N2O fluxes were measured twice a week and cumulated by linear interpolation of the gas‐fluxes of consecutive measurement dates. After completion of the gas flux measurement, concentration of ammonium and nitrate within the soil‐columns was determined. DMPP delayed the conversion of ammonium within the manure injection zone significantly. This effect was considerably more pronounced in treatment digestate + NI than in treatment slurry + NI. Regarding the cumulated N2O emissions, no difference between slurry and digestate treatments was determined. DMPP reduced the release of N2O significantly. Transferring the results into practice, the use of DMPP is a promising way to reduce greenhouse gas emissions and nitrate leaching, following the injection of slurry or digestate.

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Metadaten
Author:Martin ten HufORCiD, Hans-Werner OlfsORCiD
Title (English):Effect of the nitrification inhibitor DMPP on nitrous oxide emissions and the stabilization of ammonium following the injection of dairy slurry and digestate in a soil-column experiment
DOI:https://doi.org/10.1002/jpln.201900025
ISSN:1522-2624
Parent Title (English):Journal of Plant Nutrition and Soil Science
Publisher:WILEY‐VCH Verlag GmbH & Co. KGaA
Place of publication:Weinheim
Document Type:Article
Language:English
Year of Completion:2020
Release Date:2020/01/30
Volume:183
Issue:2
Pagenumber:7
First Page:129
Last Page:135
Faculties:Fakultät AuL
DDC classes:500 Naturwissenschaften und Mathematik / 580 Pflanzen (Botanik)
Review Status:Veröffentlichte Fassung/Verlagsversion