It is a fast release source of sulfur and calcium. Gypsum is 100% more soluble than lime! $41.16. Arizona's best, 40 lb, gypsum, loosens soil for improved water penetration encouraging deeper root systems, makes soils easier to work with, improves soil aeration for … Gypsum. Special Features. Gypsum is one of those rare materials that perform in all three categories of soil treatment: an amendment, conditioner and fertilizer. This bag of gypsum is a great value for the price! Please Note: Prices, promotions, styles and availability may vary by store and online. This inventory may include a store display unit. Inventory is sold and received continuously throughout the day; therefore, the quantity shown may not be available when you get to the store. When dissolved it releases an equal proportion of calcium and sulfate. (1) 6lb bag typically costs around $9-$11 at big box stores in my area so I opted to order it here and save a few bucks. Helps soften the soil. It increases calcium without effecting pH. ... Oldcastle Kolorscape 54055006 Yardright Soil Doctor Pelletized Gypsum Soil Conditioner, 40-Pound 4.5 out of 5 stars 41.