56 



James Stewart Wiant 







.XXV 



Figure 6. weed content in plats of Colorado and engelmann spruce 



The poor stand is due to low viability of the seed. The abundant spreading weed in the check plat (4) 

 is duckweed (fitellaria media IL.] Cyrill.). Plat 2 was treated with 0. 35411 gram of mercuric chloride, 

 and plats 3 and 5 with 3/32 fluid ounce and 5/32 fluid ounce respectively, of sulfuric acid, per square foot 



In table 20 are given the costs of representative materials which were 



TABLE 20. 



Relative Cost and Rate of Application for Different Materials 

 Used in Soil-Treatment Experiments 



* The applications of mercuric chloride, mercurous chloride, and Uspulun noted here are equivalent 

 in mercury content. 



t Based on current prices of the grades used at the Keene nursery, shipping costs not included. 



