Gabe Brown mentioned it in this lecture on regenerative agriculture. Sorry, but I don't have a timestamp, it's been a few weeks since I watched it. https://www.youtube.com/watch?v=uUmIdq0D6-A
I'm not an expert in farming, but I do know a little bit of plant biology. My understanding of what he said was that the combination of atmospheric CO2 and fertilizer increases the growth rate of the plant, but the plant doesn't uptake a proportionately larger amount of other micro nutrients, either because it is biologically rate limited or doesn't have access.
Other Googling suggests that it could be a result of selective breeding picking crops that grow faster but are less nutritious, but that would seem to be a correlated problem. Those crops tend to be selected for their ability to grow with synthetic fertilizer and *-cides, with the lack of nutritional value being an unintended consequence.
I'm not an expert in farming, but I do know a little bit of plant biology. My understanding of what he said was that the combination of atmospheric CO2 and fertilizer increases the growth rate of the plant, but the plant doesn't uptake a proportionately larger amount of other micro nutrients, either because it is biologically rate limited or doesn't have access.
Other Googling suggests that it could be a result of selective breeding picking crops that grow faster but are less nutritious, but that would seem to be a correlated problem. Those crops tend to be selected for their ability to grow with synthetic fertilizer and *-cides, with the lack of nutritional value being an unintended consequence.