N2 + 3 H2 -> 2 NH3

https://en.wikipedia.org/wiki/Haber_process

"Each ton of ammonia production requires roughly 178 kgs of hydrogen. To produce hydrogen, feedstocks such as natural gas, naphtha, or coal are employed."

https://wri-india.org/blog/emission-reduction-potential-green-hydrogen-ammonia-synthesis-fertilizer-industry#:~:text=Each%20ton%20of%20ammonia%20production,naphtha%2C%20or%20coal%20are%20employed.