44 



James Stewart Wiant 



TABLE 13. 



Liquid Treatments on Beds of Norway Spruce Sown at the Keene 

 Nursery on November 4, 1926 



* Due to an error in calculation, the aluminum sulfate and the sulfuric acid were used at half the 

 strength originally planned. 



It is rather surprising to note that the Bayer compound, shown by green- 

 house experiments 8 to be more toxic than equal concentrations of Uspulun, 

 was in this case non-injurious. 



The results with liquid treatments on spring-sown beds of 1927 are 

 presented in table 14. The plats of experiment B were sown on April 21, 

 and those of experiment A on May 7, both at the rate of 3150 seeds. The 

 two series were located several hundred yards apart. 



In experiment A, all of the treatments caused a considerable reduction 

 in the amount of damping-off and thereby increased the total emergence 

 and final stand. The low percentage of emergence noted for all the plats 

 is due to the fact that approximately only 25 per cent of the seed were 

 viable. The three mercury materials gave the greatest reduction in per- 

 centage of damping-off. However, the stronger applications of these 

 materials caused decided chemical injur y. This was manifested by a 

 failure of the seedlings to continue top growth. In normal seedlings the 

 main axis elongated from one-half to three-fourths of an inch beyond the 

 origin of the first leaves, while in severely stunted plants only one-fourth 

 inch of such stem growth had occurred. It is doubtful whether the slight 

 injury noted for the weaker mercury treatments is of any practical 

 importance. 



s Unpublished results obtained by the writer. 



