|I recently read that gypsum will loosen compacted soil and make it more conducive to growing grass. I have looked for gypsum, but cannot seem to find it. Is gypsum the same as lime and, if not, where should I look for gypsum? Thanks so much...
|Answer from NGA
June 30, 2010
|They are not the same. Gypsum is calcium sulfate, and lime is calcium carbonate. Adding lime increases the pH of the soil. Gypsum is often used as a source of calcium on soils that wouldn't benefit from increasing the pH and to loosen compacted, clay-type soils. Gypsum is usually sold in large bags in garden centers in the same area as soil amendments and fertilizers. Good luck!
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