Farm hunter, $35-$45 a ton sounds like the cost when they deliver and spread it for you on your field. $6 is if you come and get it, take it home, and spread it yourself. This is usually of a coarser mesh lime than the bagged type.

Depending on the mesh and quanity of carbonates in your local limestone, there are formulas to calculate the quanity of lime need to raise your soil PH to a desired level.

Ground quarry limestone is about 20 to 40% calcium carbonate and maybe 1 to 15% magnesium carbonate. It is these carbonates that raise the PH of the soil. The calcium in gypsum does not effect soild PH but does add cacium and sulfer.