Estimation of in-canopy ammonia sources and sinks in a fertilized Zea mays field

Environmental Science & Technology
Jesse O BashWayne P Robarge

Abstract

An analytical model was developed to describe in-canopy vertical distribution of ammonia (NH(3)) sources and sinks and vertical fluxes in a fertilized agricultural setting using measured in-canopy mean NH(3) concentration and wind speed profiles. This model was applied to quantify in-canopy air-surface exchange rates and above-canopy NH(3) fluxes in a fertilized corn (Zea mays) field. Modeled air-canopy NH(3) fluxes agreed well with independent above-canopy flux estimates. Based on the model results, the urea fertilized soil surface was a consistent source of NH(3) one month following the fertilizer application, whereas the vegetation canopy was typically a net NH(3) sink with the lower portion of the canopy being a constant sink. The model results suggested that the canopy was a sink for some 70% of the estimated soil NH(3) emissions. A logical conclusion is that parametrization of within-canopy processes in air quality models are necessary to explore the impact of agricultural field level management practices on regional air quality. Moreover, there are agronomic and environmental benefits to timing liquid fertilizer applications as close to canopy closure as possible. Finally, given the large within-canopy mean NH(3) concent...Continue Reading

Citations

Dec 6, 2016·The Science of the Total Environment·Zhaoyang MengXiaofang Jia
Oct 20, 2011·Journal of Environmental Monitoring : JEM·Melissa A PuchalskiWayne P Robarge
Apr 23, 2019·Journal of Advances in Modeling Earth Systems·Patrick C CampbellTanya L Spero
Feb 28, 2021·Journal of Environmental Sciences (China)·Jie SuYoujun Dou
Oct 24, 2019·Journal of Advances in Modeling Earth Systems·Jonathan E PleimKaren Cady-Pereira
Dec 26, 2019·Journal of Geophysical Research. Biogeosciences·Patrick C CampbellLewis Linker
Jul 5, 2021·Environmental Science and Pollution Research International·Rui ZhangYu Wang

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