Lime

A general term for materials which contain calcium. The main material used for applying to soil and turf situations where soil pH is to be made less acidic is ground limestone (which is also called chalk), with the main chemical composition being calcium carbonate. The disadvantage of using lime materials on turfgrass surfaces, is that it can encourage a less hard-wearing surface, which is prone to invasion by coarser grasses and weeds, as well as increasing the potential for disease attack.