Rivka wrote:
"c) during just about all of the evolutionary history of these plants humans were not applying P annually to supply them:
therefore, it's got to be made available by some process not involving human intervention."
That may be true, but evolution typically produces very low yields with the exclusive goal of survival of individual species. The yields nowadays of many crops remove far more P than can be supplied without the aid of human intervention.
Mark
KS
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