Gaseous emission during the composting of pig feces from Chinese Ganqinfen system

► Chinese Ganqinfen pig faces and corn stalks were co-composted in windrow. ► Covering reduced NH3 and N2O emissions, but increased CH4 losses. ► Turning decreased the N2O and CH4 losses, but enlarged the NH3 emission rate. ► Covering prolonged the maturing period, but turning activities accelerated it.