Show I Lime to Neutralize I Aid Aridity Acidity c ty of Soils No Reason for Discriminating ing Against Any Material Ground limestone screenings burned lime hydrated lime slaked air-slaked lime shells refu refuSe e lime and marl may mayall mayall mayall all be used for neutralizing soil soli acidity Which of these different forms of lime should be used In any particular case should hould be determined by the cost at which a given amount of calcium carbonate carbonate carbonate car car- bonate or its equivalent in a reasonably reasonably reasonably reason reason- ably fine condition can be delivered to the soil solI Aside from this there Is no good reason for discriminating against any of these materials Neither elther should magnesium limestone be considered con con- either more or less valuable than the ordinary calcium limestone Theoretically pounds of ot finely round ground limestone 56 G pounds of freshly freshly fresh fresh- ly burned umed lime 74 pounds of by hydrated lime and about 00 DO pounds of slaked air-slaked lime have equal acid neutralizing power In calculating the cost the price of the time material the freight If any the cost of hauling and the labor Involved in spreading It on the land should be taken talen Into account If fine finely y ground limestone can be secured delivered delivered delivered de de- livered at the nearest railroad station at 3 per ton then allowing for tho the smaller cost of handling equivalent amounts of the more concentrated fresh burnt lime should be se se- se- se forms cured at the station for lor 6 l u hydrated lime for and slaked air-slaked lime for about per ton Usually ground limestone will be bethe bethe the time most economical l and most satis satIs- satisfactory satisfactory I factory material to use In considering considerIng considering consider consider- ing the price the fineness of grinding and the freight rate must be tak taken n Into account The fine material is Ia worth more than the coarse If coarse material is used it will require more to get the same Immediate acid neutralizing neutralizing neu neu- effect A good grade of ground limestone should be fino enough so that all will pass through a mesh sieve The Time objection tJ to coarse material such as screenings Is IB that it I acts too slowly Only the fine dust will act immediately Purdue Purdue College of Agriculture |