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Fertilisers (24/02/22 20:12:52)
    Macronutrients for plants are nitrogen (N), phosphorus(P) and potassium (K).Nitrogen is in unlimited supply as it is sourced from the air, containing IIRC 78.1 percent nitrogen as N2. Together with hydrogen from natural gas it is used for synthesis of ammonia by the Haber-Bosch process. Ammonia is burnt in air to nitrogen oxides and reacted with water into nitric acid, which then is neutralised with ammonia to form ammonium nitrate, or with calcium carbonate to form calcium nitrate. For other products, calcium phosphate is reacted with nitric acid, and potassium sulfate is added.

    The phosphate is sourced from various sources, at least one of which is politically contentious (Western Sahara).

    Potassium is sourced from Belarus,which is an increasing problem.

    https://www.yara.com/crop-nutrition/why-fertilizer/production-of-fertillizer/

    --

    Well. Phosphate and potassium, in the form that are used, are limited resources. Much of it endsin sewage and goes into the ocean, with minimal attempts at recovery.

    I'll see if I can research the topic more thoroughly.
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Fertilisers