102 



time was thoroughly saturated with water, and at a depth of from 11 

 to 12 inches from the surface in the last or most strongly fertilized plat 

 sample 3 of this plat was taken. An examination of this sample after 

 it had been removed to the laboratory revealed the presence of three 

 small, partly grown wireworms, alive, and to all appearances perfectly 

 healthy, and still in their place of hibernation. As will be observed 

 by the analyses, this sample gave the strongest reaction when tested 

 for chlorine. 



These tests were made by Mr. L. M. Blooinneld, at that time assist- 

 ant chemist of the Ohio Agricultural Experiment Station, and in the 

 following manner: Of each sample 500 grams were digested in 1,000 

 cubic centimeters of distilled water for six hours, and in 100 cubic centi- 

 meters of the filtrate, equal to 50 grams of soil, the chlorine being 

 determined volumetrically by a solution of nitrate of silver, 1 cubic 

 centimeter of which equals 0.003546 gram of chlorine. 



The following are the results of the analyses, all being, as has been 

 stated, from different depths in the plat on which kainit had been 

 applied at the rate of 2,400 pounds to the acre, and it was in sample No. 

 3 that the young wireworms had evidently passed the winter: 



Sample No. 1, from surface to a depth of 1^ inches, gave 0.0039006 gram chlorine. 

 Sample No. 2, from depth of 5 to 7 inches, gave 0.0063828 gram chlorine. 

 Sample No. 3, from depth of 11 to 12 inches, gave 0.0078012 gram chlorine. 



The soil of check plat, to which no kainit had been applied, tested as 

 follows : 



Sample No. 1 gave 0.001773 gram chlorine. 

 Sample No. 2 gave 0.001773 gram chlorine. 

 Sample No. 3 gave 0.0014184 gram chlorine. 



The check samples were of course taken from the same depth as 

 those from the treated plat. These results would seem to indicate that 

 no reasonable amount of kainit applied to fields will either destroy or 

 drive away wireworms. Also, it is interesting to note that at a depth of 

 1 foot from the surface there was almost double the amount of kainit 

 present, nearly all of which must have been encountered by the worm 

 on its way downward. 





