Several elements are necessary for the proper nutrition of plants and micro-organisms. These could be divided into two groups, i.e. micronutrients and macronutrients. The elements required in small quantities for plant growth are called micronutrients and Include Iron, Zinc, Copper, Molybdenum, Manganese, Cobalt and Chlorine. Silicon, Vanadium and Sodium may also be helpful for the growth of certain species. The specific role of micronutrients In plant growth is not yet well understood, but these are known to be effective through certain enzymes, which bring oxidation / reduction reactions and plant metabolism. Some of the elements are involved in the formation of growth hormones, translocation of sugar in plant and for the symbiotic fixation of Nitrogen. The use of micronutrients either alone or in combination with other elements results in increased production, but these could also be harmful, if their available forms are in excess in the soil.