A two-year field investigation was conducted in a typical double rice region in South China. The treatments included conventional dose of nitrogen, phosphorus, and potassium fertilizers (NPKc); reduced chemical fertilizer combined with straw retention (NPKr+S); and no fertilizer as a control (CK). The global warming potential (GWP) was evaluated with nitrous oxide (N 2 O) and methane (CH 4 ) emissions. The results showed that fertilization enhanced not only CH 4 but also N 2 O emissions. For CK, NPKc, and NPKr+S, respectively, annual N 2 O emis...
