VARIATION IN THE CHEMICAL COMPOSITION OF SOILS. 



Table 2. — Chemical analyses of certain American soils. 

 [Analyses by W. O. Robinson.] 



Province and type. 



Coastal Plain: 



Norfolk sandy 

 loam — 



Soil 



Subsoil 



Limestone Valleys: 

 Decatur clay 

 loam — 



Soil 



Subsoil 



Hagerstown 

 loam — 



Soil 



Subsoil 



Glacial and Loessial: 

 Volusia silt 

 loam — 



Soil 



Subsoil 



Marshall silt 

 loam — 



Soil 



Subsoil 



Gloucester stony 

 loam — 



Soil 



Subsoil 



Piedmont Plateau: 

 Cecil clav — 



Soil." 



Subsoil 



Cecil sandy 

 loam — 



Soil 



Subsoil 



Durham sandy 

 loam- 

 Soil 



Subsoil 



York silt loam — 



Soil 



Subsoil 



Louisa loam — 



Soil 



Subsoil 



Penn silt loam- 

 Soil 



Subsoil 



Depth. 



Inches. 

 0-14 

 14-36 



0- 4 

 4-15 



0- 8 

 8-24 



0- 8 

 8-36 



0-15 

 15-36 



0- 8 

 8-36 



0- 6 

 6-36 



0- 8 

 8-36 



0-10 

 10-36 



0-10 

 10-22 



0-12 

 12-30 



0- 9 

 9-24 



Constituent. 



SiC-2 



Per ct. 

 94.50 

 85.30 



79.35 



74.81 



70.99 

 66.49 



75.12 



74.64 



75.61 

 71.43 



65.68 

 73.80 



66.49 

 44.15 



8S.57 

 55.69 



76.71 

 74.38 



84.58 

 74.99 



74.33 

 71.76 



AI2O3 



Perct. 

 2.07 



8.82 



12.80 



11.39 



14.80 



10.49 

 12.26 



9.67 

 13.44 



14.15 

 13.24 



17.11 



27.58 



5.76 

 24.42 



10.55 

 18.04 



12.85 

 1.6. 31 



5.54 

 10.90 



11.00 

 14.36 



FenOu 



Per ct. 

 0.83 

 1.91 



4.44 

 5.28 



4.23 

 5.99 



4.13 

 5.01 



3.54 

 4.28 



5.67 

 4.37 



7.43 

 16.23 



1.55 



8.83 



1.61 

 3.42 



2.81 

 2.56 



3.30 



6.75 



4.64 

 5.82 



CaO. 



Perct. 



0.39 



.38 



1.08 

 1.40 



1.36 

 1.19 



.36 



.44 



.39 

 .40 



.21 

 .26 



1.13 

 1.73 



MgO. 



Per ct. 



0.09 



.19 



.33 



1.08 

 1.93 



.21 

 .29 



.69 

 1.06 



K2O. i NaaO. 



Perct. 



0.10 



.12 



.67 

 .75 



2.71 

 3.58 



1.40 

 1.99 



2.28 

 2.03 



2.16 

 2.22 



.62 

 .61 



.82 

 1.06 



3.96 

 3.34 



3.26 

 4.07 



1.57 

 1.50 



Per ct. 



0.11 



.07 



1.03 

 .63 



1.39 

 1.75 



.16 

 .15 



.87 



.39 



. 30 



.14 



.28 



1.53 



1.54 



p 2 o 5 . 



SO3 



Perct. 



0.06 



.04 



Per ct. 

 0.07 

 .13 



