Nitrous Oxide Emissions from the Wisconsin Integrated Cropping Systems Trial: 2010

In this study we compare N2O fluxes from the 6 cropping systems at the Wisconsin Integrated Cropping Systems Trial (WICST). The WICST study was established in 1989, so the cropping system treatments have had over 20 years to progress toward new equilibriums. The study is composed of 3 grain and 3 forage cropping systems spanning a spectrum of crop diversity and perenniality, and represents a range of common Wisconsin cropping systems (Posner et al 1995).  Our study contributes insight into N2O flux from the particular climatic and edaphic context of south central Wisconsin, and will provide insight into the cumulative effect of the multiple factors that differentiate cropping systems on N2O emissions. As the experimental cropping systems model a wide range of realistic cropping systems that differ in management, crop rotation, and fertilizer regimes, the study may provide estimates for a wider range of currently utilized cropping systems and their relative global warming impacts. We utilize the static chamber methodology of measuring fluxes of trace gases. This methodology has been shown to provide a good basis for relative comparison of treatments and is cost effective (Hutchinson and Livingston 1993).

Authors: Will Osterholz, Joshua Posner, and Janet Hedtcke