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Sustainable agriculture via carbon-farming must account for the cost of building soil organic carbon. Eg. 1000 kg of stable soil organic carbon will need to sequester 100 - 120 kg of N. This nutrient cost of carbon-farming has been explicated by Richardson et al. 2014. AgroNum is a simple way around this so-called dilemma (van Groenigen et al. 2017 by ensuring that crop residues are sufficiently rich in N to be properly humified into stable SOC.

Artificial intelligence implements collective intelligence. By expressing yields & N-fertilizer use efficiences as a function of N-fertilization & soil productivity, AgroNum transforms a complex CAI problem - comparing the level of sustainability of cropping practices on different soils & pedoclimates from all across Europe, into a simple one - iAgroNum.

En agriculture durable, AgroNum ne quantifie pas précisément la matière organique du sol. AgroNum précise plutôt les objectifs de rendements azotés, RDN (kg-N_grain/ha), selon le taux de fertilisation azotée, TUN (kg-N_fertilisant/ha). La durabilité est assurée par des rendements unitaires, RUN (kg-N_grain/kg-N_fertilisant) médians, ni trop hauts, ni trop faibles.

In response to IFRS-ISSB survey & exposure draft methodology for enhancing the international applicability of the SASB Standards, Polyor SAS has proposed plot-specific N-fertilizer response curves & a unique iAgroNum index as accountable standard metrics of sustainable agriculture. This will contribute the ergonomics of carbon-farming & integrated fertilizer management.

A simple & precise way to evaluate the sustainability of a cropping practice on any given field across Europe? iAgroNum. RSQ is the harvested yield for any grain-crop such as cereales, rapeseed, grain-corn or sunflower, and rRSQ the corresponding sustainable target yield at that N-fertilization rate. Sustainable cropping practices have iAgroNum values close to 1. Its that simple.

How can the sustainability of cropping practices & schedules be objectively assayed across vast geographical areas comprising fields & soils inherently very different. Polyor SAS has developed a rational approach to sustainable agriculture than takes into account N-fertilization, soil & crop productivity.

The International Sustainability Standards Board has developed an exposure draft that explains the methodology for updating references to laws and regulations to improve the international applicability of SASB standards. The ISSB published the exposure draft. Polyor SAS will respond proposing changes to the FB-AG-110a.1 & FB-AG-110a.2 standard accounting metrics.

Polyor SAS's AgroNum approach to sustainable agiculture & integrated fertilizer mangement has just been re-parameterized for Europe on 1 719 sites comprising more than 20 000 different cropping schedule.

SASB standards applicable to agricultural products, and in particular FB-AG-100a.1 & a.2 pertaining to GHG emissions (Metric tons (t) CO2-e) are pertinent but imprecise. Agricultural production is not industrial. Agricultural fields are not smokestaks.

Apparently, (soil) conservation agriculture & ecologically intensive agriculture are not as trendy as they use to be. Dommage! Probably too common sense, but above all not lucrative enough given that carbon-credits & carbon-farming are relatively recent additions to sustainable agriculture.

Healthy soils tend to have decent fungi-to-bacteria ratios (rFB). Malik et al. 2016 note that the significant role of fungi in litter decomposition and indicate that F:B ratios are linked to higher carbon storage potential. Using georeferenced data from Siles et al. 2023 Polyor SAS was capable of illustrating that the soil's inherent productivity with little or no N-fertilizer - i.e. aN1_AgroNum, is in fact higher on soils with higher rFBs.

What is central to digital agriculture today? Interoperability! Polyor SAS's AgroNum™ technology in interoperable with precision agriculture technologies and predictive micro-climatology.