Corrigendum: Simplicity on the far side of complexity: optimizing nitrogen for wheat in increasingly variable rainfall environments (2020 Environ. Res. Lett. 15 114060)
Figure 4.Wheat grain yield as a function of available N at various levels of evapotranspiration for (a), observed and (b), simulated data. For the observed data set grain yield was expressed Y =−1523+ 9× N − 0.029× N2 + 16× ET− 0.023× ET2 + 0.03× ET× N; (R2 = 0.47; P value < 0.001; N = 960). For the simulated data grain yield was similarly expressed as Y =−1161+ 3× N − 0.05× N2 + 14× ET− 0.02× ET2 + 0.09× ET× N; (R2 = 0.73; P value < 0.001; N = 1814). Linear regression of model performance against observed yields ((c) RMSE= 986 kg ha−1; R2 = 0.47), and simulated yields ((d) RMSE= 681 kg ha−1; R2 = 0.73). and the figures were generated. Hence, the originally published figures and statistical values (R2, RMSE and P values) are correct.