Fig. 1. Overall map of the field site area (47°01' N; 96°36' W), located in Clay County, MN where soil and gas flux sample were collected in the Red River Valley (RRV) agricultural region. Weather station location is also shown, from which continuous soil temperature data were collected. Above the regional map is an aerial photograph (2004) indicating proximity of organic field (T2O), conventional field (T2C), and reference site to each other.