Check the listing for details. Magnesium Sulfate Fertilizer. Condition: Open box. Listed at 9.50 USD. We buy in bulk and repackage it in plastic bags for youMagnesium Sulfate FertilizerControls Magnesium deficiency (yellowing between the veins of older leaves on plants). On palms, this deficiency appears as yellowing of older leaflets while the center of the palm blade remains green. Eventually, the tips of the older leaves will brown. Most plants respond well to the addition of SA-50 Magnesium Sulfate and will return to a dark green color after the application. The soil pH can also be a factor in magnesium deficiency and should be maintained at about 6.0 - 6.5. No mixing/spraying; use as a dry fertilizerCorrects Magnesium deficiency in shrubs and treesAcidifies soils with less risk of staining Use on: Citrus, palms, trees, shrubs, annuals, and turf Contains: Fertilizer grade Magnesium Sulfate, Magnesium as Metallic 14.0%. Not for spray application. Rate of application: 1-2 Lbs. per 100 sq. ft., or 1/2-1 Lb. per 5 feet of tree spread Guaranteed Analysis Plant Nutrients Total Magnesium as Mg15.0% Water Soluble Magnesium as Mg Derived from: Magnesium Sulfate