118 NATUEE AND PROPERTIES OF SOILS 



for example, while averaging .147 per cent, nitrogen, range 

 from .043 to .539. Louisiana ^ soils average .049 per cent, with 

 a range from .001 to .109. In muck and peat the amount of 

 nitrogen is much higher, attaining in some eases 3 per cent. 



The following figures indicate the nitrogen contents that 

 may be expected in average soils: 



Table XXIII 



PERCENTAGE OF NITROGEN IN CERTAIN REPRESENTATIVE SOILS 



OP THE UNITED STATES 



Dbsceiption 



Soil 



Subsoil 



71 Cecil soils of North Carolina ^ 



165 Norfolk soils of North Carolina ^. . 



16 Loess soils of Central U. S.^ 



381 Kentucky soils ^ 



.048 

 .039 

 .154 

 .120 

 .338 



.024 

 .020 

 .083 

 .070 



30 Minnesota till soils ^ 



.092 







While the ratio between the respective amounts of soil 

 nitrogen and organic matter is no more constant than that 

 between the organic carbon and the organic matter 

 (C X 1.724 = organic matter), it is of some general value. If 



^V^Talker, S. S.^ Chemical Compositio'n of Some Louisiana Soils as to 

 Series and Texture; La. Agr. Exp. Sta., Bui. 177, Aug., 1920. 



-^Williams, C. B., ei; al., Beport on the Piedmont Soils, Particularly 

 with Meference to their Nature, Plant-food 'Requirements and Adapta- 

 bility to Different Crops; Bui. N. C. Dept. Agr., Vol. 36, No. 2, Feb., 

 1915. 



® Williams, C. B., et al., Beport on Coastal Plain Soils, Particularly 

 with Eeference to their Nature, Plant-food Requirements and Suitability 

 for Different Crops; Bui. N. C. Bept. Agr., Vol. 39, No. 5, May, 1918. 



^Eobinson, W. 0., et al., Variation m the Chemical Composition of 

 Soils; TJ. S. Dept. Agr., Bui. 551, June, 1917. Alway, F. X, and MeBole, 

 G. E., The Loess Soils of the Nehrasha Portion of the Transition Re- 

 gion: I. PLygroscopioity, Nitrogen and Organic Carbon; Soil Sei., 

 Vol. r, No. 'S, pp. 197-238, Mar., 1916. Also, Bennett, H. H., Soils and 

 Agriculture of the Southern States, pp. 332-353 ; New York, 1921. 



^ Averitt, S. B., The Soils of Kentucky; Ky. Agr. Exp. Sta., Bui. 193, 

 July, 1915. 



®Bost, 0. 0., and Alway, F. J., Mvnnesota Glacial Soil Studies: I. A 

 Comparison of the Soils of the Late Wisconsin and the lowan Drifts; 

 Soil Sei., Vol. XI, Ro. 3, pp. 161-200, Mar., 1921. 



