There is no nitrogen dilemma - this is an incorrect conclusion that demonstrates stoichiometric arguments are inadequate for understanding the infinite complexity of agri/ecological systems.
It also demonstrates misunderstandings about the chemical kinetics associated with SOCS processes and how these are most cost effectively achieved - ie certainly not with artificial nitrates from Haber-Bosch process; this is a red herring that has no place in this discussion. No wonder UK aquifers are awash with dangerous levels of nitrates if academia and presumably governments also work with such misunderstandings of best least cost plant nutrition.
Natural systems recieve ample nitrogen nutrient from the digestive function of ruminants; converting cellulose to nitrogen. The dispersal of this nutrient naturally to pastures, or significantly only after composting to arable land, can best and most cost effectively enable SOCS processes.
There are only a very few arid regions in the world where such agro-ecological practices cannot quickly restore social welfare, soil carbon, rainfall and climate.
1% annual SOCS is being consistently achieved here in Cotswolds with exclusively cattle sourced nutrient; the French “4 per 1000” (4p1000) initiative is reasonable and achievable. Some areas will struggle with 0.4% SOCS per annum but most will comfortably over-achieve this by returning to safely and slowly evolved traditional and indigenous farming practices.