... grade light magnesia as raw material. Fertilizer grade Magnesium Sulfate monohydrate(feed grade, fertilizer grade) and magnesia. The quality of ... chemical company.Magnesium sulfate is a high-quality dual-nutrient fertilizer, Sulfur and magnesium are trace elements of crops, it ... sulfate can be used as the basis of fertilizer, top dressing and foliar fertilizer, can be applied individually, or as ...