Q: My university soil test says I have a significantly low 4.6 pH. They recommend 45-55 pounds of lime per 1000 sq. ft. Is this enough to raise the pH permanently to 6.5? What is the best time to put it on the lawn. Do we have to water it right away?
A: The university lime recommendation seems fine to me. You can add lime any time. The amount to add each year to keep the pH at the optimum 6.5 pH level will vary with the amount of rain or irrigation the grass receives, the composition of the soil and the amount of fertilizer you apply. I recommend you re-test the soil after two years’ time. Details at How to Soil Test