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Minerals known to be required in large amounts for plant growth are macronutrients. The primary macronutrients: nitrogen (N), phosphorus (P), potassium (K); the three secondary macronutrients: calcium (Ca), sulfur (S), magnesium (Mg);. Macronutrients are consumed in large quantities and are required for plant tissue from 0.2% to 0.4% (on dry matter weight basis).