Macronutrients (nitrogen,
phosphorus, potassium, calcium, magnesium and sulfur) are plant nutrients
required in the largest amount in plants. Micronutrients (iron, copper,
manganese, zinc, boron, molybdenum and chlorine) are required in
relatively smaller amounts. Additional mineral nutrient elements which are
beneficial to plants but not necessarily essential include sodium, cobalt,
vanadium, nickel, selenium, aluminum and silicon