. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . uch alarm should not be occasioned by the results ofexperiments which have been conducted under unnaturalconditions, and with unreasonably large quantities ofslaked or burned lime. Slaked lime becomes quickly carbonated. —It must furtherbe borne in mind that recent investigations have shownthat slaked and burned lime, if applied in reasonableamounts, change quickly in the soil into the form of cal-cium carbonate; hence it is essentially, as concer
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . uch alarm should not be occasioned by the results ofexperiments which have been conducted under unnaturalconditions, and with unreasonably large quantities ofslaked or burned lime. Slaked lime becomes quickly carbonated. —It must furtherbe borne in mind that recent investigations have shownthat slaked and burned lime, if applied in reasonableamounts, change quickly in the soil into the form of cal-cium carbonate; hence it is essentially, as concerns subse-quent effect, as if it had been applied as such at the the course of earlier experiments made by Heiden, heconcluded that in some cases lime remained in a causticstate in the soil for years; it appears, however, that heassumed that all lime found soluble in water and capableof producing an alkaline reaction was necessarily present inthe soil as calcium hydrate. The falsity of this assumptionis evident in view of the fact that calcium carbonate, ifplaced even in distilled water, is somewhat soluble and will 278 FERTILIZERS. cause it to give an alkalinereaction. Furthermore, car-bonic acid, which is alwayspresent in the rainfall andin the soil water, increasesdecidedly the alkaline reac-tion, by virtue of formingcalcium bicarbonate. Again,salts of lime formed by otherweak acids may themselvesgive an alkaline reaction inwater. This experiment byHeiden has been widely citedby various writers as a rea-son why hydrated or burnedlime should not be appliedto soils, yet had they takenthe pains to investigate thecircumstances, it would havebeen found that the con-clusion of Heiden was notjustified by the experimen-tal method which was fol-lowed. The - bearing of theMaryland station experi-ments. —? Still another ex-periment, made at theMaryland agricultural ex-periment station, has beengenerally cited in theUnited States as showinggreat superiority of calcium LIME
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfertili, bookyear1913
