NiSO4, or nickel(II) sulfate, is an inorganic compound composed of nickel, sulfur, and oxygen. It typically appears as a greenish crystalline solid and is soluble in water. This compound is often used in electroplating, as well as in the production of nickel salts and catalysts. In addition to its industrial applications, NiSO4 is also utilized in agriculture as a micronutrient for plants. Nickel is essential for certain plant enzymes, and its presence in fertilizers can help improve crop yields. However, care must be taken, as excessive nickel can be toxic to both plants and animals.