Sure it harvests energy from the sun. The question is whether it harvests enough energy to cover the inputs and the inherent losses in the system. Again, I suspect that the answer to that is NO.
What kind of corn crop would you get if you went year on year with corn without adding significant amounts of manmade nitrogen? That 175 bu crop would be down to 100, then 75, then 50 and probably decline from there fairly rapidly. I don't imagine there's anyone out there with much interest in proving that... They wouldn't make any money proving that, so they add chemical N.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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