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Evaluation of calibrated passive sampling for quantifying ammonia emissions in multi-plot field trialswith slurry application

  • There is a great need for simple and inexpensive methods to quantify ammonia emissions in multi-plot field trials. However, methods that meet these criteria have to be thoroughly validated. In the calibrated passive sampling approach, acid traps placed in the center of quadratic plots absorb ammonia, enabling relative comparisons between plots. To quantify ammonia emissions, these acid trap samplings are scaled by means of a transfer coefficient (TC) obtained from simultaneous measurements with the dynamic tube method (DTM). However, dynamic tube measurements are also comparatively costly and time-consuming. Our objective was to assess the best practice for using calibrated passive sampling in multi-plot field trials. One particular challenge in such experiments is to evaluate the influence of ammonia drift between plots. In a series of eight multi-plot field trials, acid traps and DTM were used simultaneously on all plots to measure ammonia emissions caused by different slurry application techniques. Data obtained by both methods were correlated, and the influence of the ubiquitous ammonia background on both methods was evaluated by comparing net values, including the subtraction of the background with gross values (no background subtraction). Finally, we provide recommendations for calculating a TC for calibrating relative differences between plots, based on simultaneous acid trap and dynamic tube measurements on selected plots. Treatmentmean values obtained by bothmethods correlatedwell. For most field trials, R2 values between 0.6 and 0.8were obtained. Ammonia background concentrations affected both methods. Drift between plots contributed to the background for the acid traps, whereas the contamination of the chamber system might have caused the background for the DTM. Treatments with low emissions were comparatively more affected by that background. For a robust application of calibrated passive sampling, we recommend calculating the TC based on a treatment with high ammonia emissions, reducing the relative influence of the ubiquitous ammonia background.

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Author:Martin ten HufORCiD, Thorsten ReinschORCiD, Christof KlußORCiD, Christoph Essich, Reiner RuserORCiD, Caroline Buchen-TschiskaleORCiD, Andreas Pacholski, Heinz Flessa, Hans-Werner OlfsORCiD
Title (English):Evaluation of calibrated passive sampling for quantifying ammonia emissions in multi-plot field trialswith slurry application
URN:urn:nbn:de:bsz:959-opus-61040
DOI:https://doi.org/10.1002/jpln.202200333
ISSN:1522-2624
Parent Title (English):Journal of Plant Nutrition and Soil Science
Document Type:Article
Language:English
Year of Completion:2023
Release Date:2024/05/27
Volume:186
Issue:4
First Page:451
Last Page:463
Faculties:Fakultät AuL
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 630 Landwirtschaft, Veterinärmedizin
Review Status:Peer Reviewed
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International