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Specifications
| Purity as MgSo4 7H2O | 99.5% to 99.9% |
| Magnesium Sulphate as MgSo4 | 48.50% min |
| Magnesium Oxide as Mg0 | 16% to 17% min |
| Magnesium as Mg | 9.60% min |
| Sulphur as SO4 | 38.5% min |
| Sulphur as S | 12.70% min |
| pH of 5% aq. solution | 7 (+/-) 0.5% |
| Chlorides of CI % by mass | 0.0009% |
| Lead as Pb | Nil |
| Arsenic as As2O3 | < 1 ppm |
| Iron as Fe | 10 ppm |
| Manganese as Mn | 15 ppm |
| Water soluble | Fully soluble |
Magnesium Sulphate Heptahydrate (Epsom Salt) provides a soluble source of Magnesium and Sulphur for plants. Magnesium is a secondary micronutrient. Magnesium is the central atom of the chlorophyll molecule and is therefore important in photosynthesis. Magnesium is important in protein synthesis and enzyme processes, and it helps plants to absorb and use phosphorous and nitrogen. Magnesium sulphate heptahydrate can be applied dry to the soil, dissolved and used as a foliar spray or dissolved in hydroponic nutrient solutions. It can be incorporated into fertilizer blends.
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