The last such report I saw pinned lower micronutrient density not on the quality of soils, but on higher atmospheric CO2 concentrations, leading to quicker grow

The last such report I saw pinned lower micronutrient density not on the quality of soils, but on higher atmospheric CO2 concentrations, leading to quicker growth of the plants. Plants in lower concentrations grew more slowly but had relatively more micronutrients for the same mass.