Plant Nutrition Sixteen nutrients are essential for plant growth. Carbon is obtained from carbon dioxide in the air; oxygen is obtained directly from oxygen in the air or indirectly from carbon dioxide; and hydrogen which is obtained from water. The other thirteen nutrients are obtained from the soil. Nitrogen, potassium, sulfur, calcium, and magnesium are required in larger amounts and are referred to as macronutrients. Iron, zinc, copper, manganese, boron, molybdenum, and chlorine are needed in smaller amounts and are referred to as micronutrients. Regardless of the quantity used by the plant, all sixteen of these are essential nutrients, that is, required for plant growth. Without any one of these sixteen essential nutrients, the plant will not grow.
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