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Elements used in large quantities by the plant are termed macronutrients, which can be further defined as primary and secondary. The primary nutrients include nitrogen (N), phosphorus (P) and potassium (K). These elements contribute to plant nutrient content, function of plant enzymes and biochemical processes, and integrity of plant cells. Deficiency of these nutrients contributes to reduced plant growth, health and yield. Thus, they are the three most important nutrients supplied by fertilizers. The secondary nutrients include calcium (Ca), magnesium (Mg) and sulphur (S).