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How does nitrogen derived from natural guano and nitratine deposits and alternative chemical processes compare to the Haber Process?

Also, how much electricity does the Haber Process require compared to alternative technologies? Apparently that was a large issue with some of the alternative technologies, but the Haber Process still seems to consume a significant amount of electricity. For example, it takes 12 MWh of hydroelectricity to produce a ton of ammonia using the Haber Process with electrolysis vs. 15 MWh of electricity to produce a ton of nitric acid using the Birkeland–Eyde process, and ammonia is a precursor product to nitric acid.
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