Sustainable agriculture & soil conservation in field-crop production is also all about reducing yield gaps. Schils et al. 2018 were quite explicite in that respect. Polyor SAS's AgroNum approach to setting sustainable cereal target yields & N-fertilizer recommendations is a means to that end. As compared to conventional regional yield-averages, AgroNum sustainable target grain & nitrogen yields are on average & 70% of the time, higher.