Our products are produced from the ore of ourselves. MgSO4 (min) 48.3%. Size and packing at buyers' option. In agriculture and gardening, magnesium sulfate is used to correct magnesium deficiency in soil .It is most commonly applied to potted plants, or to magnesium-hungry crops, such as potatoes, roses, tomatoes, peppers and cannabis. The advantage of magnesium sulfate over other magnesium soil ...