. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . ssaid to winter-kill, which was really seldom the case. that the problems connected with the use of lime are ofa very complex character. 427. Kinds of lime used in agriculture. — Burned lime, rock lime, stone lime, and builders 4imeare various names given to the final product after the car-bon dioxid of limestone or marble has been expelled byheat. In this process 100 pounds of pure limestone (cal-cium carbonate) lose about 44 pounds of carbon dio
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . ssaid to winter-kill, which was really seldom the case. that the problems connected with the use of lime are ofa very complex character. 427. Kinds of lime used in agriculture. — Burned lime, rock lime, stone lime, and builders 4imeare various names given to the final product after the car-bon dioxid of limestone or marble has been expelled byheat. In this process 100 pounds of pure limestone (cal-cium carbonate) lose about 44 pounds of carbon dioxidand yield about 56 pounds of calcium oxid (CaO, or lime).Most limestone is so impure that the product, after burn-ing, usually contains not more than from 95 to 98 per cent LIME AND ITS RELATION TO SOILS 263 of lime; and certain highly magnesian limestones yield,upon burning, a product containing about 60 per cent oflime and about 40 per cent of magnesia. Dolomite is the most highly magnesian of limestones,and it contains before burning per cent of lime per cent of magnesia. Magnesian limestones are common, yielding a burned. Unlimed Limed Sulfate of ammonia Unlimed Limed Nitrate of soda Fig. 28.—Treatment of Silene orientalis. All fertilized alike with potash 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, fo
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