Extended Data Figure 2 : Exponential models describing the relationship between N2O emissions and nitrogen rate.

From: Pursuing sustainable productivity with millions of smallholder farmers

Extended Data Figure 2

N2O–N emissions were plotted against nitrogen rate for maize (n = 417), rice (n = 740) and wheat (n = 395). Red dotted lines are IPCC model-based calculations35. NC, CC and SC refer to north China, central China and south China, respectively, for maize and wheat production; NC-R, YR-R and SC-R refer to north China, Yangtze River Basin and south China, respectively, for rice production. **P < 0.01 and *P < 0.05 indicate the significance of the regression.