52 



NATURE AND PROPERTIES OF SOILS 



Table VIII 



COMPARATIVE COMPOSITIONS OP COASTAL PLAIN AND RESIDUAL 

 SOILS OF EASTERN UNITED STATES.^ 



Constituents 



1 

 Costal Plain 



2 

 Residua Ti 



SiOo 



93.44 



.69 



1.96 



1.17 



77.72 



TiOs 



.90 



ALO. 



9.13 



FeioO. 



3.75 











Table IX 





COMPARATIVE COMPOSITIONS OP NORTH CAROLINA COASTAL PLAIN 



AND RESIDUAL SOILS.^ 



Constituents 



1 

 Costal Plain 



2 



Coastal Plain 



3 



Eesidual 



N 



.038 

 .027 

 .286 

 .221 



.138 

 .033 

 .346 

 .394 



.048 



P,0, 



.041 



K2O 



1.330 



CaO 



.200 







^Eobinson, W. 0., et al., Variation in tJie 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. 



^Williams, C B., et ah, Heport on the Coastal Flain Soils; Bui. 

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



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

 th« typical soil of the Atlantic coastal plain. 



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

 series isi above the average coastal plain soil in organic 

 matter and fertility. 



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

 Dept. of Agr., VoL 36, No. 2, Peb., 1915. 



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

 the typical residual soil of the Piedmont plateau. 



