Fig. 3. Dinitrogen emissions from farrow-to-finish (FF) and farrow-to-wean (FW) production systems: (a) FF dinitrogen emissions vs. time, (b) FF surface and sludge temperatures vs. time, (c) FW dinitrogen emissions vs. time, and (d) FW surface and sludge temperatures vs. time. Error bars include measurement error and the unequal emissions spatial distribution of anaerobic decomposition in the lagoons.