Essential Nutrients: Macronutrients and Micronutrients
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An essential nutrient is required for a plant's life cycle, irreplaceable by another element, and acts directly in nutrition; macronutrients are needed in bulk, micronutrients in trace amounts.
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Carbon, abundant in plant dry mass, is a macronutrient; trace-needed iron is a micronutrient.
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"Macro" and "micro" describe quantity, not importance — a trace-nutrient deficiency can limit growth as much as a bulk-nutrient one.