54 



James Stewart Wiant 



again bird injury was so severe that detailed comparisons between different 

 treatments cannot be made. All treatments except those numbered 4. L5, 

 and 21, however, gave significant increases in final stand over that of the 

 check. No evidence of stunting was apparent from any of the treatments. 



Miscellaneous species. During the season of 1927, tests were made 

 with liquid treatments of mercuric chloride, sulfuric acid, and Uspulun 

 on beds of austrian and scotch pine, Colorado, engelmann, and white spruce, 

 and european larch. Four rows each of two different species were sown in 

 each plat, and three replications of each treatment were made. Since 

 the incidence of disease was low in most of the beds, the experiment was 

 of value chiefly in determining the effects of the treatments upon the 

 growth of seedlings during the first season. It is apparent from table 19 



TABLE 19. Effect of Liquid Treatments upon Austrian and Scotch Pine, 

 Colorado, Engelmann, and White Spruce, and European Larch 



* Treatments 1 and 5 are equivalent in mercury content, as are also treatments 2 and 6. 



that for the most part the treatments were not injurious to the two pine 

 species. The larger applications of mercuric chloride and Uspulun caused 

 injury to Colorado spruce, while only the acid treatments were satisfactory 

 on engelmann spruce. European larch and white spruce were severely 

 stunted by all the mercury treatments, while the two concentrations of 

 sulfuric acid caused slight and medium stunting, respectively. 



Effect of the treatmt nts on germination and subsequent growth of the seedlings 



In presenting the results of the soil-treatment experiments, attention 

 was called to the injurious effects noted from the application of chemicals 

 in certain cases. Such injury, when it resulted from treatments made at 

 the time of seeding, was manifested by a retardation of root development 



