Iron(II) sulfate is used in a variety of ways, mainly as a source of iron and sulfur. In agriculture and horticulture, it is an important iron fertilizer used for the rapid correction of iron deficiency (chlorosis) in plants, particularly in viticulture. It is often mixed into lawn fertilizers because it enables effective moss control and ensures a rich green color for the lawn.

Further Applications:

• Water Treatment: Here, it is used as a precipitating and flocculating agent to remove phosphates and suspended solids from wastewater.

• Industry: It serves as a raw material for the production of other iron compounds, as a chromate reducer in cement, and for the desulfurization of biogas and wastewater to prevent the formation of foul-smelling hydrogen sulfide.

• Wood Protection: Outdoors, it can be used to protect wood from fungal and moss infestation, which can lead to a characteristic graying of the wood.