TABLE II. 
FERTILITY IN VIRGIN AND CROPPED SOILs. 
363 
Pounds Per Acre in Two Million Pounds of Surface Soil and Four Million Pounds of Subsoil. 
MATERIAL. Virgin Virgin | Cropped | Cropped 
Soil. Subsoil. Soil. Subsoil. 
AY SLL TUE yTea eT es An FP ee eo 105,600 | 128,000 77,600 | 130,000 
JBIDRCTILS), sc soaer erence eee he RGD Etta eo SMD ea cae dE ara oe 39, 600 24,000 20,800 16,000 
USIICHRE REET Le ahs Sach MR rT IR RE ee oa eee | 3,600 2,800 2,600 2,400 
LECONAS HEIST (CE DLO EN) See ee es tid | 32,464 66, 702 34,416 68,121 
PoOimasiuime (ACI SOlUDIE) yn. 2k w.s.cc ee cmttee os puciete > heite ¢ le 4615 12,773 4,080 12,063 
Phosphorus (Atcia soluble). 65.6.2. a Seda ose lee ac rs dese 1,046 1,221 959 1,221 
WalciumiCActdsoluble)) © ao ou. came nae sacsns dears ces 6,864 9,724 6, 864 14,586 
Magnesium (Acid soluble).......... | 4,953 14,496 4,832 14,496 
Memooanese (AICIdisOlUp le): 4). oc eenw seccleee hs a eicatuesisied o « | 2,016 2,304 1,008 2,592 
Stuilfalavane (CANGRG LCoS YIE))Ss Hee Se MA yas ene se ome one nse 480 800 480 640 
MiMVestone Tequinren CACIGIGY)) 2... csumnes tones cle wee oe 60 2,600 100 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. 
