MicroKote is designed to improve nutrition and root development of plants grown in containers. MicroKote contains calcium, copper, iron, magnesium, manganese and zinc bound in a latex coating to provide delayed release of the nutrients when the roots reach the sides of the container. The actual purpose of Microkote is supposed to be a deliver system of micro nutrient and not root pruning. In the past there has been copper coated containers used for root pruning by coating the inside of the container wall to kill the root tips, supposedly causing root branching. Copper is an essential element for plant growth, but copper coated pots release huge quantities of copper into the container growth medium, thereby destroying the desirable ratios and proportions among the micronutrients. John Ruther found that 3,000 ppm of copper is needed to do root pruning. This amount of copper cause a problem of copper in excess, absorption of iron becomes restricted, causing the common chlorosis of plants in copper coated pots. - Millet