Terms such as chelates refer to organo metalic molecules of varying sizes and shapes in which the organic part binds the metal cation (nutrient) in a ring like structure. The organic chelating agent is known as the “ligand” (example chelated Ethylene Diamine tetra Acetic Acid] Which is negatively charged and forms covalent bonds with the positively charged metal cation. Thus micronutrients which can be chelated are Cu++, Fe++, Mn++, Mg++, Ca++ and Zn++. The ligand holds the nutrient cation in its grip. The object (nutrient cation) is held so long as the grip is sufficiently tight, that is the bonds are sufficiently strong but it can be freed as soon as the grip is loosened. Thus a ligand can bind as well as release the micronutrient cation.