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The second purpose for using gypsum for lawns is when calcium is needed, but you do not require a change in the soil's pH. Calcium (lime) is needed by plants in large amounts and, therefore, calcium makes up about 65% of the soil's cations. Only Magnesium can equal calcium in total amounts needed by plants.
Lime, also known as agricultural limestone, neutralizes soil acidity and provided calcium and magnesium available for plant uptake. Gypsum is a calcium sulfate containing product that provides both calcium and sulfate to the soil system. No change in pH can be expected from a gypsum .
Hydrated lime and burned lime contain more readily available calcium than do basic slag and gypsum. Gypsum does not affect soil pH even though it contains calcium. Magnesium. Magnesium is adequate for crop production in most Mississippi soils except the coarse sandy soils of the Coastal Plains and the heavy dark clays of the Blackbelt Prairie.
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