Exergy assessment of topsoil fertility

Soil degradation, affecting around 38% of the world's cropland, threatens global food supply. Due to soil's complexity, measure soil degradation that involves loss fertility due crop system management processes represents an unsolved problem. Exergy is a property with potential be used in and/or analysis. A methodology determine exergy value fenced fertile its inorganic and organic components established this study will applied evaluate fertility, quality. As first step, perfect topsoil optimum characteristics called "OptSOIL" determined. The by agronomic expertise allow establishing general theoretical reference suitable execute assessments soils compare grade any concerning best possible. Consequently, we introduce planetary crust made “OptNUT” “OptSOM” invariant independent different local textures, but not their water content aeration. We call imaginary -copiously fertile- Pristinia as opposed Thanatia, dead state referring abiotic resources. Thus, real agricultural intermediate between Thanatia. This idea might serve quantitatively diagnose assessment all concepts which degraded. has been validated through laboratory tests for soils, concluding rigorous indicator fertility.