http://www.vegetariat.com/2015/12/plant-guild-4-nitrogen-fixing-plants/
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It would be pompous for us to believe that plants, which began about 450 million years ago on Earth, just fiddled around until their true keepers (humans) came along and evolved enough to produce chemical nitrogen to dump onto their roots.
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Oh how true, how true!
Bob
http://www.PuraVidaAquatic.com