Ground burnt limestone will work much faster, and in all cases lime is applied in tons per acres, the minimum is usually a ton and in some cases 2 tons to the acre. You can also use hydrated lime which doesnt require as much but not reccomended for Ag. thats the kind that is used for mortar.. You can buy ground at Walmarts for $1.40 a bag, but it has to be applied with a drop spreader, not a spinner spreader..