1. Can I use Gypsum as a soil amendment?
Yes, Gypsum contains Calcium and Sulfur and could be used as an amendment in Calcium deficient soils or if you would like to adjust the pH level.
2. How much Gypsum do I use for soil drench?
We do not have general dilution rates for the product to be used for soil drench.
Each soil is unique and the dilution rate to use in a soil drench depends on many factors: the quality of your soil, what you will be growing etc., as with any fertilization.
So we would advise doing a soil test and applying based on the deficiencies shown.