When applying lime it is important to be able quantify a number of issues other than the actual cost, and cartage and spreading costs. The quality of the product plays an important part in the pH neutralising capability of the lime. Lime can be sourced from many places, each having different characteristics, both within and between pits. It is necessary to know what the quality of lime being purchased and how effective is will be at neutralising pH.
This calculator uses published values* it discounts the NV to account for the reduced effect of larger particle sizes which reduce the short term capacity of the lime to change the soil pH.
*Neutralising value and relative efficiencies of particle sizes in changing soil pH of 100, 50 and 20% for limes less than 0.5 mm, 0.5 - 1.0 mm and greater than 1.0 mm are from Cregan, P.D., Hirth, J.R. and Conyers, M.K. (1989) Amelioration of Soil Acidity by Liming and Other Amendments. In "Soil Acidity and Plant Growth" (A.D. Robson, ed.), pp. 205-264. Academic Press