Ferrous sulfate heptahydrate is an iron salt commonly used in agriculture to correct iron deficiencies in soil, promoting healthy plant growth. It is also utilized in water treatment, where it serves as a flocculant to remove impurities. In the pharmaceutical industry, ferrous sulfate is an important iron supplement used in the treatment of iron deficiency anemia. Additionally, it finds applications in the manufacture of pigments, including iron oxide-based colors for industrial use.