. The nature and properties of soils; a college text of edaphology. Soils. THE ORGANIC MATTEE OF THE SOIL 117 range from .73 per cent, to per cent., while similar fig- ures on the Russian Tschernozen^ vary from to with an average of per cent. The subsoil of course runs lower in every case. The following figures, while far from representative, are suggestive: Table XXII PERCENTAGE OP ORGANIC MATTER (0 X ) IN CERTAIN REPRESENTATIVE SOILS OP THE UNITED STATES. Description 8 Residual soils—Robinson ^ 3 Glacial and loessial soils—Robin- son ^ 2 Kansas till soils—Call ^ 6
. The nature and properties of soils; a college text of edaphology. Soils. THE ORGANIC MATTEE OF THE SOIL 117 range from .73 per cent, to per cent., while similar fig- ures on the Russian Tschernozen^ vary from to with an average of per cent. The subsoil of course runs lower in every case. The following figures, while far from representative, are suggestive: Table XXII PERCENTAGE OP ORGANIC MATTER (0 X ) IN CERTAIN REPRESENTATIVE SOILS OP THE UNITED STATES. Description 8 Residual soils—Robinson ^ 3 Glacial and loessial soils—Robin- son ^ 2 Kansas till soils—Call ^ 6 Nebraska loess soils—^Alway *... 30 Minnesota till soils—Rost and Always. Subsoil .64 As the soil nitrogen is carried almost wholly by the organic matter, and is a true organic constituent of the soil, its con- sideration at this point is opportune. The nitrogen ® of soils varies with the organic matter and may range in surface mineral soils from .01 to .60 per cent. West Virginia ^ soils, ^ Kossowitsch, P., Die Schwarzerde; Internat. Mitt. f. Bodenkimde, Band I, Heft 3-4, S. 316, 1912. ^Eobmson, W. 0., The Inorganic Composition of Some Important American Soils; IT. ^ Bept. Agr., Bui. 122,1914. ®Call, L. E., ei qIa, Soil Survey of Shawnee County, Kansas; Kans. Agr. Exp. Sta., Bui. 200, 1914. *Alway, F. J., and McDole, G-. E., TJis Loess Soils of the Nehraslca Portion of the Transition Begion: I. Hygroscopic^tyf Nitrogen and Organic Carbon; Soil Sei, Vol. I, No. 3, pp. 197-238^ Mar., 1916. ^ Eosi, 0. 0., and Alway^ P. J., Minnesota Glacial Soil Studies; I. A Comparison of the Soih of the Late Wisconsin and lowan Drifts; Soil Sci., Vol. XI, No. 3, pp. 161-BOO, Mar., 1921. ^'Soil nitrogen is determined by either the Kjeldalil or the Gunning method. These will be described later. See paragraph 165. ''Salter, E. M., and Wells, C. F., Analyses of West Virginia Soils; W. Va. Agr. Exp. Sta., BuL 168, Dec, Please note that these images are extracte
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