New paper out on cover crops effects on N2O emissions over multiple freeze-thaw events
New open access paper published in the Canadian Journal of Soil Science from Yuanpei Gao's MSc research at the University of Guelph. Find it here: https://cdnsciencepub.com/doi/full/10.1139/cjss-2023-0017
We used the flux gradient method to continuously measure N2O emissions from a conventional corn–soybean rotation. We investigated the effects of summer-established cover crops and interactive effects of fall cultivation (tillage) practices in the fall, which is a management approach used to terminate cover crops. Measurements were taken over a six-month non-growing season that was characterized by several freezing and thawing periods (i.e., weather events in cold climates that lead to significant contributions of total N2O emissions).
Total non-growing season emissions varied nearly 2.5-fold among treatments from 395.1 (no cover crop and no fall cultivation) to 978.1 (cover crop plus fall cultivation) g N2O-N ha−1. Compared with the control treatment (no cover crop and no fall cultivation), just fall cultivation alone and cover crops alone increased total non-growing season N2O emissions, while cover crops with fall cultivation increased N2O fluxes even more. Careful cover crop species selection and management are important to avoid elevated non-growing season emissions.
Nongrowing season soil nitrous oxide emissions as influenced by cover crops and fall tillage termination
Authors: Yuanpei Gao, Kira A. Borden, Shannon E. Brown, and Claudia Wagner-Riddle
Publication: Canadian Journal of Soil Science https://doi.org/10.1139/cjss-2023-0017