EXPERIMENT STATION BULLETINS. 



481 



average tree is 8.1 inches, giving an average mean annual diameter growth 

 of .23 inches. The mean annual height growth is 0.8 feet. 



Two hundred European larch were planted, of which only three re- 

 main. Of these two are healthy and growing rapidly, the third is par- 

 tially suppressed and dying. Their ^average mean annual growth in 

 diameter is 0.16 inches and in height, 0.7 feet. Apparently the species 

 is able to do well if it gets a good start and is not suppressed. It is, 

 however, liable to injury by late frosts. 



Of the 100 red cedars planted, only about 6 remain. Many, however, 

 have been cut for Christmas trees which partly accounts for the high 

 rate of loss. The red cedar is very intolerant of shade and many of the 

 trees in the interior of the plantation were suppressed. Its rate of growth 

 has been very slow, the trees averaging only 3 inches in diameter. This 

 species might be used for ornamental planting in this part of the State 

 but its slow growth precludes its use for forest planting. 



Fifty white spruce were set out in the rows next to the Norway spruce. 

 There remain about a half dozen specimens, varying in diameter from 

 2 to 3.5 inches and from 15 to 20 feet in height. Although the white 

 spruce was less favorably situated than the Norway spruce, the great 

 difference in growth cannot be laid entirely to that, and seems to be 

 conclusive evidence that for planting on relatively dry sites, for a short 

 rotation at least, the Norway spruce is the better tree. Further north, 

 however, the white spruce might make the better showing. 



Of the 100 arborvitae, or white cedar, originally planted, several re- 

 main and their average diameter is 2 inches. The site is too dry for this 

 species which is a tree requiring considerable soil moisture. 



The following table gives the diameter and height of both the maximum 

 and average trees of various species in the plantation 32 years after it 

 was established. 



Average 



height, 



feet. 



Red pine 



Norway spruce 



Pitch pine 



White pine 



Scotch pine. . . . 

 European larch 



Red cedar 



White spruce . . 

 White cedar . . . 



61 



28 



28 

 25 

 24 

 27 

 25 

 20 

 18 

 11 



