when they tell you the amount of lime per acre, they are assuming you have 100% lime. the stuff i can get from a quarry for $6/ton is 62% EC. so if my soil test recommends 2000 lbs of lime per acre, i would need to buy around 3200 lbs of lime from the quarry. also, the soil test is assuming you are incorporating the lime in the top 6" of the soil. if you are doing less than 6" (like 5, 4, 3 or 2 inches) there is a percentage chart that comes with the test to tell you how much less lime you would need for a corresponding lower depth of incorporation.

the soil test can also list organic content if you want it. i know some preplant herbicide application rates can vary depending on the organic content of the soil. when it's around 5-10%, the application rate increases by about 33% (but don't quote me on this, read your label).