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Lead, an Important Nutrient? (add-on)
It seems unlikely that Lead was meant to be put in the category of 'major
nutrients' rather than Potassium or Phosphorous, etc.. In the same sentence,
Amano lists examples of important trace minerals 'such as iron, magnesium,
molybdenum'. Maybe Lead was meant to be put into that category (if it's not
just an error). If it is an important element, it seems worth knowing about,
even if it's only required (?) in trace amounts.