Instruct: Classify an Amazon review as either positive or negative.
Query: Gypsum is a gyp

Gypsum is not a fertilizer. It is not a soil conditioner. It is a source of sulphur for soils. It will help reduce the sodium content in highly salty soil. But it will not add calcium to the soil or raise the Ph. There is very little need for use by gardeners in most of the US. Save your money. Get a soil test from your local or state ag university or extension service to see what you would need in fertilizer or compost.