Answer: Applying gypsum to your soil is an excellent way to help loosen heavy clay soils. Gypsum improves soil porosity, which is the soil's ability to absorb nutrients. Gypsum will allow easier soil penetration for seedling grass and can be applied at a rate of up to 60 lbs. per 1,000 feet of lawn area. I would reseed the area first and allow the new grass to grow 2-3 inches high. After the second or third mowing you can apply gypsum and it will work its way into the soil. There's no reason that you cannot apply it at any time, in amounts as suggested on the label. Good luck with your lawn!
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