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Are calcium (Ca), magnesium (Mg), and sulfur (S) defined as micronutrients?

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Are calcium (Ca), magnesium (Mg), and sulfur (S) defined as micronutrients?

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NO. They are defined as secondary nutrients. A report of Arsenic (As) analysis IS NOT required if a product contains ONLY the primary nutrients N, P2O5, or K2O and/or the secondary nutrients Calcium (Ca), Magnesium (Mg), or Sulfur (S).

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