Prabhat Fertilizer Zinc Sulphate Heptahydrate 21% is a nutrient-rich fertilizer that contains zinc (Zn) at a concentration of 21% and Sulphur (Sulphur) at a concentration of 10%. (NPK). A chemical substance that is clear, colorless, and crystalline, and is very water soluble. It is popularly known as vitriol and is employed as a Heptahydrate. According to tradition, zinc binds to proteins and organic acids in plants. In high quantities, it hinders the growth of moss and other plants, but the precise percentage of our fertilizer guarantees that plants receive exactly the quantity they require. Zinc plays a role in the production of auxins, which are plant growth regulators, as well as a variety of metabolic processes. Both photosynthesis and nitrogen metabolism require zinc. Zinc deficiency affects flowering and fruit development by delaying maturity and lengthening the vegetative period, resulting in lower yields and lower quality output.