363 



TABLE II. 



Fertility in Virgin and Cropped Soils. 



Pounds Per Acre in T>vo Million Pounds of Surface Soil and Four Million Pounds of Subsoil. 



Material. 



Virgin 



Virgin 



Cropped 



Soil. 



Subsoil. 



Soil. 



105,600 



128,000 



77,600 



39,600 



24,000 



20,800 



3,600 



2,800 



2,600 



32,464 



66,702 



34,416 



4,615 



12,773 



4,080 



1,046 



1,221 



959 



6,864 



9,724 



6,864 



4,953 



14,496 



4,832 



2,016 



2,304 



1,008 



480 



800 



480 



60 



2,600 



100 



Cropped 

 Subsoil. 



Volatile matter 



Humus 



Nitrogen 



Potassium (Total) 



Potassium (Acid soluble) 



Phosphorus (Acid soluble) 



Calcium (Acid soluble) 



Magnesium (Acid soluble) 



Manganese (Acid soluble) 



Sulphur (Acid soluble) 



Limestone required (Acidity) 



130,000 

 16,000 



2,400 

 68,121 

 12,063 



1,221 

 14,586 

 14,496 



2,592 

 640 



1,120 



Table II gives the pounds of the different elements in the plowed soil 

 of 2,000,000 pounds per acre, and in the subsoil of 4,000,000 pounds per 

 acre. It shows the same relative differences as given in Table I, but in 

 different terms. 



The writer wishes to acknowledge the assistance of Mr. J. C. Beavers 

 of the Soils and Crops Department, also of Mr. J. B. Abbott, formerly of 

 the same department, who collected most of the soil samples analyzed. 



