Micronutrients are elements that are essential for plant growth, but are required in much smaller amounts than nitrogen, phosphorus and potassium. The micronutrients are boron (B), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn), and chloride (Cl).
The micronutrients Cu, Fe and Mn are involved in various processes related to photosynthesis, therefore their deficiency will result in reduced plant growth, and/or leaf chlorosis; along with Zn they are also associated with various enzyme systems; Mo is specific for the nitrate reductase enzyme only. Boron is the only micronutrient not specifically associated with either photosynthesis or enzyme function; it is associated with the carbohydrate chemistry and reproductive system of the plant.
Fertilizer sources: ICL Fertilizers' granular NPK, PK and NP fertilizers can be formulated to include the micronutrients (Zn, Cu, Mn, B) upon request. Incorporation during manufacture results in uniform distribution of micronutrients throughout the granular fertilizers. This is a convenient method of application of micronutrients, as it enables uniform distribution in the fields.