>1 bushel of corn is about 370MJ. 1kg of hydrogen is 142MJ. So 2.3GJ of hydrogen makes 92GJ of corn. That’s about 3%, not 50%. This was basically my point. >5

>1 bushel of corn is about 370MJ. 1kg of hydrogen is 142MJ. So 2.3GJ of hydrogen makes 92GJ of corn. That’s about 3%, not 50%. This was basically my point. >50% from (FIXED) nitrogen is wrong, though. Sorry, I wasn't clear. I was saying that 50% of the artificial energy input (i.e. excluding free sunlight to the plants) IS from the nitrogen, rather than farming equipment, transportation, etc.