following the recommended application rates based on your soil test results. Gypsum is another excellent source of calcium, especially if you need to add calcium without affecting soil pH.

“To prevent calcium deficiency, I recommend amending the soil with limestone or gypsum, which are natural sources of calcium carbonate and calcium sulfate, respectively,” Payne says.

Many nutrients, such as calcium and magnesium, may be supplied to plants solely from reserves ... 50-100 ----- Cations on the soil's exchange sites serve as a source of resupply for those in soil ...

C2 – concrete exposed to moisture and an external source of chlorides from deicing ... ACI also prohibits the use of calcium chloride when soil or ground water contains enough sulfate to be ...