Some role of the micronutrients are :
1.Nitrogen: Increases the size of the leaves, promotes rapid growth along with fruit and seed development and hastens the maturity of the crop.
2. Phosphorus: activates coenzymes for the production of amino acid used in the synthesis of protein, and is important in metabolic processes as well.
3. Potassium: involved in the opening and closing of stomata, protein synthesis, maintenance of turgidity of cells, facilitates cell division and growth and activation of enzymes.
4. Calcium: involved in the normal functioning of cell membranes during the formation of the mitotic spindle.
5. Magnesium: Helps in the formation of fruits and nuts and in the germination of seeds as well.
6. Sulphur: obtained by plants in the form of sulphate ion