. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . he most important form of limefound in soils. Notwithstanding the wide distribution of limestonerocks over most of the globe, there are nevertheless soilsupon which it appears probable that lime is sometimeseven needed as plant food, though perhaps in such casesonly in connection with restricted classes of plants. Gen-erally, however, if 1 me is required at all, it is as a soilamendment, either in a neutralizing or flocculating capac-ity. As a neu
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . he most important form of limefound in soils. Notwithstanding the wide distribution of limestonerocks over most of the globe, there are nevertheless soilsupon which it appears probable that lime is sometimeseven needed as plant food, though perhaps in such casesonly in connection with restricted classes of plants. Gen-erally, however, if 1 me is required at all, it is as a soilamendment, either in a neutralizing or flocculating capac-ity. As a neutralizer it exerts a powerful influence upon 261 262 FERTILIZERS the character of the microscopic soil flora, thus vitally-affecting ammonification, nitrification, denitrification, andnitrogen assimilation. Lime also affects the development of certain diseases,not only on the roots, but also on the aerial portions ofplants. It is because of these many functions of lime in the soiland of the many cases of contradictory effects, dependentupon the character of the soil, upon the kind of plantgrown, and upon the particular plant disease involved,. Fig. , where before liming it could not be grown successfully. It wassaid 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 o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfertili, bookyear1913
