4 BULLETIN 731, U. S. DEPARTMENT OF AGRICULTURE. 



poisoned cotton daily. "When the cotton matured a remarkable 

 sight was presented. The unpoisoned cotton showed practically no 

 open bolls, while the poisoned plat to the very last row was practi- 

 cally Avliite with open cotton. This is illustrated in figures 1 and 2, 

 winch show different views of the dividing line between the poisoned 

 and unpoisoned cotton shortly after the first killing frost. When the 

 cotton was picked it was found that the unpoisoned plats yielded 45 

 and 65 pounds of seed cotton per acre, respectively, while the poisoned 

 plat yielded about 500 pounds per acre. This, of course, did not 

 constitute a good yield of cotton but was very remarkable in view 

 of the opportunity which this cotton had had to produce a crop. 



Fig. 1.— View showing dividing line between poisoned and unpoisoned cotton on Algodon Cut No. 1 

 October 30, 1916, Tallulah, La. Beginning of additional unpoisoned cotton can be distinguished at 

 upper right-hand corner of view. 



This test was jDarticularry interesting because of the severe conditions 

 winch prevented the unpoisoned cotton from making any production, 

 because the plants were so small, and because it was possible to poison 

 the last row of the treated plat effectively without allowing the 

 poison to drift on to the adjoining check row. For this reason the 

 line of demarcation between the plats was much more pronounced 

 than usually was possible. 



Additional tests during the same season located in better cotton 

 frequently gave larger gains in production per acre, but of course the 

 percentage of gain was not so large. In one case of poisoning during 

 the month of July a gain of about 600 pounds of seed cotton per acre 

 was secured. Figures '4 and 4 show a comparison of the typical 



