52 



NATURE AND PROPERTIES OF SOILS 



Table VIII 



COMPARATIVE COMPOSITIONS OF COASTAL PLAIN AND RESIDUAL 

 SOILS OF EASTERN UNITED STATES. 1 



Constituents 



Si0 2 . 

 Ti0 2 . 

 A1 2 3 

 Fej 2 O a 



2 

 Kesidual 



77.72 



.90 



9.13 



3.75 



Table IX 



COMPARATIVE COMPOSITIONS OF NORTH CAROLINA COASTAL PLAIN 

 AND RESIDUAL SOILS. 2 



Robinson, W. O., et ah, Variation in the Chemical Composition of 

 Soils; U. S. Dept. Agr., Bui. 551, June, 1917. 



1 and 2. Average analyses of 15 coastal plain and 8 residual soils, 

 respectively, taken from various places in eastern United States. 



2 Williams, C. B., et ah, Beport on the Coastal Plain Soils; Bui. 

 N. C. Dept. of Agr., Vol. 39, No. 50, May, 1918. 



1. Average of 165 analyses of Norfolk series soils. This is 

 the typical soil of the Atlantic coastal plain. 



2. Average of 84 analyses of Portsmouth series soils. This 

 series is above the average coastal plain soil in organic 

 matter and fertility. 



Williams, C. B., et ah, Beport on the Piedmont Soils; Bui. N. C. 

 Dept. of Agr., Vol. 36, No. 2, Feb., 1915. 



3. Average of 71 analyses of Cecil series soils. This series is 

 the typical residual soil of the Piedmont plateau. 



