Zinc helps produce auxins. Zinc is a growth promoting substance that controls the development of the shoot. Zinc also forms enzyme systems, which regulate plant life. Yet zinc is the most common micronutrient deficiency in agriculture today! Zinc deficiency can limit yields of com, beans, wheat, cotton, sorghum, fruits, and vegetables.

Zinc sulfate is the most commonly used source of zinc in granular fertilizers because of its high solubility in water and its relatively low cost of production. Zinc sulfate heptahydrate and zinc sulfate monohydrate have the highest solubility and are suitable for use in all types of soils.