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Liming to a pH of 6.0 to 6.5 or higher provides an ideal environment for bacteria in soils and increases the supply of soil phosphorus available to plants. Agricultural liming materials include limestone (both calcitic and dolomitic), burned lime, slaked lime, marl, shells, and by-products like sugar beet lime and sludge from water treatment plants. In Minnesota, liming materials are analyzed and sold on the basis of Effective Neutralizing Power (ENP). Discover how to determine the need for lime and decide on the appropriate lime material.