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<p>Improving direct field measurement techniques to quantify gas emissions from cropped agricultural fields is challenging. We compared nitrous oxide (<span class="inline-formula">N₂O</span>) emissions measured with static closed chambers to those from a newly developed aerodynamic flux gradient (FG) approach. Measurements were made at a vegetable farm following chicken manure application. The FG calculations were made with a single open-path Fourier transform infrared (OP-FTIR) spectrometer (height of 1.45&thinsp;m) deployed in a slant-path configuration, sequentially aimed at retro reflectors at heights of 0.8 and 1.8&thinsp;m above ground. Hourly emissions were measured with the FG technique, but once a day between 10:00 and 13:00 with chambers. We compared the concurrent emission ratios (FG<span class="inline-formula">∕</span>chamber) of these two techniques and found <span class="inline-formula">N₂O</span> emission rates from a celery crop farm measured at midday by FG were statistically higher (1.22–1.40 times) than those from the chambers measured at the same time. Our results suggest the OP-FTIR slant-path FG configuration worked well in this study: it was sufficiently sensitive to detect the <span class="inline-formula">N₂O</span> gradients over our site, giving high temporal resolution <span class="inline-formula">N₂O</span> emissions corresponding to a large measurement footprint.</p>