It's not a necessity that nitrogen fertilizer comes from fossil fuels.
Some of the first massive deployments of hydrogen electrolyzers are fir making ammonia fertilizer, replacing natural gas with solar-driven processes.
Also, I don't think that Borlaug is super closely associated with the fertilizer, as much as with breeeding hardier strains or shorter stalks, to prevent loss of wheat crops or rice crops, for example. For that matter, manure could ne used as fertilizer for the Green Revolution, there's no dependency on the Haber process, that was an entirely different revolution both in time and geography.
Some of the first massive deployments of hydrogen electrolyzers are fir making ammonia fertilizer, replacing natural gas with solar-driven processes.
Also, I don't think that Borlaug is super closely associated with the fertilizer, as much as with breeeding hardier strains or shorter stalks, to prevent loss of wheat crops or rice crops, for example. For that matter, manure could ne used as fertilizer for the Green Revolution, there's no dependency on the Haber process, that was an entirely different revolution both in time and geography.