1912. 



PUBLIC DOCUMENT — No. 31. 



41 



Table 3. — ■ Averages of Normal Surface Soils used for Over Thirty Suc- 

 cessive Years for the Cultivation of Tobacco. 



Moisture, 



Nitrogen, . 

 Phosphoric acid. 

 Potassium oxide. 

 Calcium oxide, . 

 Sodium oxide. 

 Magnesium oxide, 



Soil No. 1. 



Per 



Cent. 



20.0000 

 .0970 

 .2341 

 .1940 

 .2131 

 .1291 

 .0440 



Pounds 



per 



Acre. 



2,910 

 7,023 

 5,820 

 6,393 

 3,873 

 1,-320 



Soil No. 2. 



Per 

 Cent. 



20.0000 

 .0810 

 .1535 

 .2020 

 .3300 

 .2340 

 .0291 



Pounds 

 per 

 Acre. 



2,430 

 4,605 

 6,060 

 9,900 

 7,020 

 873 



Soil No. 3. 



Per 

 Cent. 



20.0000 

 0604 

 .0810 

 .1691 

 .3450 

 .1192 



Pounds 

 per 

 Acre. 



1,812 

 2,430 

 5,073 

 10,350 

 3,576 

 2,640 



Table 4- — Analyses of Subsoils taken from Field used for Over Thirty 

 Successive Years for the Cultivation of Tobacco. 



Two hundred grams of each soil and subsoil were also washed 

 with 1,000 cubic centimeters of hot water. The solution was 

 evaporated to dryness and a chemical analysis was made of 

 the soluble residue. The results are computed on the basis 

 of 20 per cent, moisture in the soils ; thej are also expressed 

 in terms of pounds per acre of the various ingredients. 



