Lime is a raw material. You can either buy it as a dry powder, or as a wet slurry. It will be green, white or gray in color.
assitant
Lime is made in factories, and can be bought at stores, and sometimes at your local farm supply store.
assistant
How can I add calcium to soil?
user
There are three ways to add calcium to soil:

•   use lime, which contains calcium,

•   use gypsum, which contains calcium, or

•   use the nutrient calcium nitrate, which contains calcium.
assistant
Where can I get lime?
user