Extended Data Figure 3 : Exponential models describing the relationship between NO3 leaching and nitrogen rate.

From: Pursuing sustainable productivity with millions of smallholder farmers

Extended Data Figure 3

The NO3 leaching was plotted against nitrogen rate for maize (n = 238), rice (n = 150) and wheat (n = 201). The red dotted line is the IPCC model-based calculation35. NC, CC and SC refer to north China, central China and south China, respectively, for maize and wheat production. **P < 0.01 indicates the significance of the regression.