FORES? PLANTING IN THE INTERMOUNTAIN REGION. 



29 



the transplant bed sometimes makes 3-2 stock more desirable than 

 3—1 stock. From Table 13 it may also be seen that although in 

 normal seasons 3-1 stock is preferable, 3-2 stock can be satisfactory. 



Table 13. — Comparison of age classes of Engelmann spruce stock. 



Age class. 



Source of seed (na- 

 tional forest) . 



Average 

 diameter 



of stem 

 at root 

 collar. 



Average 

 length 

 of top. 



Average 

 length 

 of root. 



Average 

 weight 

 of top. 



Average 

 weight 

 of root. 



Ratio of 

 weight 

 of root 

 to weight 

 of entire 

 plant. 



2-2 (1919) 





Inches. 

 0.20 

 .16 

 .20 

 .08 

 .14 

 .11 

 .17 



Inches. 

 7.5 

 5.9 

 5.6 

 3.4 

 6.8 

 3.8 

 5.2 



Inches. 



11.6 

 9.9 



11.9 

 9.7 

 9.6 

 9.2 



13.0 



Grams. 

 13.22 

 6.96 

 8.44 

 1.46 

 4.65 

 2.08 

 6.40 



Grams. 

 3.54 

 2.98 

 4.98 

 .65 

 1.11 

 1.73 

 3.52 



Per cent. 

 21.1 



3-1 (1919) 



3-2 (1920) 



do 



30.0 

 37.1 



3-0(1921). 





30.8 



5-0(1921) 



Gunnison ._ . 



19.3 



3-1 (1921) 



Routt 



45.4 



3-2 (1921) 





35.5 









Sites suitable for Engelmann spruce. — This species has been planted 

 principally in the natural spruce zone. However, a few plantations 

 have been made outside, and therefore the altitude of these tests 

 ranges from 7,400 to 10,000 feet. The majority of the plantations 

 were confined to old burns in the spruce zone either strewn with 

 logs, bare, or grown up to grass or underbrush, and to aspen stands 

 both with and without a dense undergrowth of shrubs and herbaceous 

 plants. 



The survival in the plantations and percentage of vigorous trees 

 at the last examination are given in Table 14. The differences in 

 the survival on the different sites are worthy of note. An old burn 

 having an open brush cover and down logs scattered over it had a 

 survival of 84 per cent at the end of the fourth year. Two planta- 

 tions on old log-strewn burns had survivals of 59 and 47 per cent at 

 the end of the fourth year. There was an almost complete survival 

 of those trees which were planted on the north side of logs, stumps, 

 or bushes, while most of those without protection were dead. An 

 adjacent plantation in a dense stand of brush gave poorer results, 

 a survival of 24 per cent with only 17 per cent of vigorous trees at 

 the end of the fourth year. Poorer results were secured under aspen, 

 but this site is undoubtedly better adapted to Douglas fir than to 

 Engelmann spruce. 



