TOBACCO INVESTIGATIONS. 



29 



Table V. — Chemicals applied, and Rates of Application. 



Pounds per Acre. 



Formaldehyde, 

 Copper sulfate, 

 Iron sulfate, 

 Mercuric chloride, . 

 Potassium permanganate. 

 Sulfuric acid, . 

 Sulfur, . . . . 

 "By-product A," 



1,200 



100 



50 



25 



50 



300 



1,000 



1,000 



The sulfur and "By-product A" were applied dry and thoroughly 

 mixed with the 3 inches of top soil. The formaldehj^de was so diluted 

 that it was applied at the rate of one-half gallon of solution to the square 

 foot of surface. On the first j^ear's plots observations of a miscellaneous 

 character were taken in addition to the root-rot data. The observations 

 relating to growth are noted in the following table. They were made two 

 weeks before harvesting. The growth data are calculated on the basis of 

 the checks equalling 100, the plots being greater or less than this. 



Table VI. — Table showing Development of Tobacco in 1917 on Chemi- 

 cally Treated Plots. 



Chemical. 



Amount ap- 

 plied 

 (Pounds per 

 Acre). 



Color. 



Growth 

 (Check = 100; 



Treatment). 



Formaldehyde, 

 Sufuric acid. 



Sulfur, . . . . 

 Mercuric chloride, . 

 Copper sulfate. 

 Ferrous sulfate. 

 Potassium permanganate, 

 "By-product A," 



4,800 

 2,400 

 1,200 



1,200 

 600 

 300 



2,000 

 1,500 

 1,000 



100 

 80 

 25 



400 

 200 

 100 



1,000 

 500 

 250 



300 

 100 

 50 



4,000 

 2,000 

 1,000 



Normal, 

 Normal, 

 Normal, 



Normal, 

 Normal, 

 Normal, 



Light, . 

 Normal, 

 Normal, 



Normal, 

 Very dark, 

 Very dark, 



Normal, 

 Normal, 

 Normal, 



Light, . 

 Normal, 

 Normal, 



Normal, 

 Normal, 

 Normal, 



Normal, 

 Normal, 

 Normal, 



100 

 125 

 125 



125 

 100 

 100 



40 

 60 

 100 



45 

 90 

 100 



lOO-f 



110 



110 



94 

 87 

 100 



87 

 85 

 85 



94 

 94 

 100 



