These long-term (read : sustainable) N-fertilizer response (blue) curves for wheat (cf. Van_Grinsven et al. 2022, Nature Food - https://lnkd.in/ewdnFT2p) are very similar to Polyor's AgroNum N-response curves (www.polyor.fr). Integrated fertilizer management (ifm ; fertilisation raisonnée, fr) IS sustainable agriculture.