. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . otash and phosphoric acid. A like amount of nitrogen was used in each case. product containing amounts of magnesia ranging from themerest traces to about 40 per cent. Burned limestone is often ground, without slaking, andsold, without further treatment, for direct application tothe land. In other cases the lime is slacked by the addi-tion of about one-third its weight of water, when thereresults a fine, dry product known as water-slaked, ormore co
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . otash and phosphoric acid. A like amount of nitrogen was used in each case. product containing amounts of magnesia ranging from themerest traces to about 40 per cent. Burned limestone is often ground, without slaking, andsold, without further treatment, for direct application tothe land. In other cases the lime is slacked by the addi-tion of about one-third its weight of water, when thereresults a fine, dry product known as water-slaked, ormore commonly as hydrated lime (Ca(OH)2). This isproportionately poorer in lime than before slaking, on 264 FERTILIZERS account of the addition of the hydroxyl groups (OH).Frequently lime is slaked by mere exposure to theair, whereby it takes on water and carbon dioxid, form-ing a mixture of calcium carbonate and calcium long and complete exposure to the air, under themost favorable conditions, hydrated lime and air-slakedlime become practically reconverted into calcium car-bonate. Other sources of carbonate of lime for agriculture pur-. Unlimed Limed Sulfate of ammonia Unlimed Limed Nitrate of soda Fig. 29. — fertilized alike with potash and phosphoric acid. A like amount ofnitrogen was used in each case. poses are wood-ashes, the waste from the manufacture ofacetone, soda, and from other industrial processes. The chief materials used for furnishing carbonate oflime are, however, ground shell marl, ground oystershells, and ground limestone or marble. These are namedin their order of availability. Ground limestone andmarble are the least efficient, chiefly on account of theircrystalline structure. 428. The effect of lime on nitrogen availability. — It LIME AND ITS RELATION TO SOILS 265 often happens in soils which are deficient in carbonate oflime that the application of burned, air-slaked, or hydratedlime, ground limestone, or marl has an almost immedi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfertili, bookyear1913
