Micronutrients are essential elements required by plants in smaller quantities compared to macronutrients, but they are nonetheless crucial for various physiological processes and overall plant growth and development. Here are the essential micronutrients for plant growth along with common sources:
| ELEMENT | FUNCTION | SOURCE |
| Iron (Fe) | Essential for chlorophyll synthesis, electron transport, and enzyme activation. | Iron sulfate iron oxide |
| Zinc (Zn) | Involved in enzyme activation, protein synthesis, and hormone regulation. | Zinc sulfate zinc oxide |
| Manganese (Mn) | Required for photosynthesis, enzyme activation, and nitrogen metabolism. | Manganese sulfate manganese oxide |
| Copper (Cu) | Essential for enzyme activation, electron transport, and lignin synthesis | Copper sulfate copper oxide |
| Boron (B) | Involved in cell wall formation, pollen germination, and sugar transport. | Borax, boric acid |
| Molybdenum (Mo) | Required for nitrogen fixation, enzyme activation, and nitrate assimilation | Sodium molybdate |
| Chlorine (Cl) | Involved in photosynthesis and osmotic regulation. | Chloride salts, such as Sodium Chloride Potassium chloride |
| Nickel (Ni) | Essential for nitrogen metabolism, urease activity, and hydrogen metabolism. | Nickel sulfate, nickel chelates |
These micronutrients are typically supplied to plants through soil applications, foliar sprays, or hydroponic nutrient solutions. It’s essential to ensure that plants receive adequate levels of all essential nutrients for optimal growth and development. However, excessive micronutrient levels can also be harmful to plants, so proper nutrient management and soil testing are crucial for maintaining nutrient balance.