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," 



The sulfur and "Bj^-product A" were applied dry and thoroughly 

 mixed with the 3 inches of top soil. The formaldehyde 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 year'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 VL — Table shoicing Development of Tobacco in 1917 on Chemi- 

 cally Treated Plots. 



Chemical. 



Amount ap- 

 plied 

 (Pounds per 

 Acre). 



Color. 



Growth 

 (Check = 100; 



no 

 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 



100-t- 



110 



110 



94 

 87 

 100 



85 

 85 



94 

 94 

 100 



