Per the product label for Soaker Plus on general turf lawns:
For maintenance: Apply 4-8 ounces of Soaker Plus per 1,000 square feet in 1 gallon of water. Repeat 4-8 ounces of Soaker Plus per 1,000 square feet in 1 gallon of water on a weekly basis until problem is corrected. Reapply monthly as needed.
For curing stress problems. Apply 8 ounces of Soaker Plus 1,000 square feet in 1 gallon of water. Reapply weekly at 4-8 ounces per 1,000 square feet as necessary.