Fig. 4. Nitrous oxide fluxes (mean ± SEM) measured at the soil-atmosphere interface between 4 Aug. 2004 and 8 Apr. 2005 with respect to number of days following manure amendment application for organic (T2O), conventional (T2C), and reference sites. Soybeans were in both fields between days –112 and –55. Fields were fallowed between days –8 and 135.