Synthetic Kieserite VS Magnesium Sulfate(Espsom Salt)
1. Composition & Form Property Synthetic Kieserite Magnesium Sulfate (Epsom Salt) Chemical Formula MgSO₄·H₂O (Monohydrate) MgSO₄·7H₂O (Heptahydrate) Magnesium Content ~27% MgO (16% Mg) ~16% MgO (10% Mg) Sulfur Content ~22% S ~13% S Hydration Level 1 water molecule (low moisture) 7 water molecules (high moisture) 2. Physical Properties Property Kieserite Epsom Salt Appearance White or gray White crystalline crystals Water Solubility Soluble but slower to dissolve Highly soluble (instant in water) Moisture Sensitivity Low — storage stable High — can cake and absorb moisture Bulk Density Higher Lower (fluffier) 3. Origin & Production Synthetic Kieserite-Made by thermal dehydration of magnesium sulfate heptahydrate or by reacting magnesium oxide/hydroxide with sulfuric acid, then crystallizing into monohydrate form.-Can also occur naturally in salt deposits (natural kieserite).-Granulated forms are common for agriculture. Epsom Salt-Usually crystallized from natural brines or seawater, or made by reacting magnesium carbonate/hydroxide with sulfuric acid.-Primarily used in medical, bath, and garden applications. 4. Agricultural Application Factor Kieserite Epsom Salt Release Speed Medium — dissolves gradually in soil moisture Fast — dissolves instantly in water Best Use Base fertilizer, blending in NPK, bulk spreading Foliar spray, fertigation, quick correction of Mg/S deficiency Soil Suitability Acidic & neutral soils Any soil (fast correction) Application Frequency Longer residual effect Needs more frequent application 5. Cost & Handling -Kieserite is usually cheaper per unit of Mg in bulk agriculture and better for large-scale field application because of its granule stability.-Epsom salt is more expensive per Mg unit, better for small-scale or emergency nutrient correction, and often sold in finer crystal form. Quick Summary Choose Kieserite → If you want a slow-to-medium release, high Mg content, bulk-spread fertilizer that stores well.–Choose Epsom Salt → If you want instant dissolution for quick Mg/S correction via foliar spray or fertigation.
