Nitrous oxide emitted from cropland constitutes a significant component of the agricultural sector’s overall greenhouse gas footprint. In order to accurately evaluate mitigation strategies, predict impacts, and model system behavior under future climate scenarios, it is essential to have access to flux measurements collected under regionally relevant conditions of soil, weather, and management strategies. As part of the Climate Change Mitigation and Adaptation in Dairy Production Systems of the Great Lakes Region USDA Coordinated Agricultural Project, we are measuring nitrous oxide flux from a typical dairy forage rotation in south-central Wisconsin. The rotation consists of one year of corn and three years of alfalfa, receiving liquid dairy manure fertilization in corn and alfalfa establishment years. Fluxes have been tracked over two growing seasons, and comparisons are possible between years as well as between phases of the rotation. Ultimately this data will be used to calibrate models for use in footprinting and benchmarking efforts and in predicting future productivity and resilience of dairy-based systems.
Author
Collier Sarah smcollier@wisc.edu University of Wisconsin-Madison
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