Evaluation of calibrated passive sampling for quantifying ammonia emissions in multi‐plot field trials with slurry application

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