34 



BULLETIN 55, U. S. DEPARTMENT OP AGEICULTURE. 



Table 10. — Average growth oj balsam fir %n New York, on the bas-is oj age, on flat, swamp, 



and hardwood slope. 





Flat. 

 (Based on 248 trees.) 



Swamp. 

 (Based on 158 trees.) 



Hardwood slope. 

 (Based on 277 trees.) 



Age 

 (years). 



Height. 



Growth 



ia height 



every 5 



years. 



Annual 

 growth 

 in height 

 within 

 5-year 

 period. 



Height. 



Growth 



in heighc 



every 5 



years. 



Annual 

 growth 

 in height 

 within 

 5-year 

 period. 



Height. 



Growth 



in height 



every 5 



years. 



Annual 

 growth 

 in height 

 within 

 6-year 

 period. 



10 



Feet. 

 5 

 9 



14 



19 

 23 

 27 

 31 

 35 

 38 

 41 

 43 

 45 

 47 

 49 

 51 

 52 

 53 

 54 

 55 

 56 

 57 

 58 

 59 

 59 

 60 

 60 

 61 

 62 

 62 



Feet. 



Feet. 



Feei. 



4 



7 

 11 

 15 

 19 

 23 

 27 

 30 

 32 

 34 

 36 

 38 

 40 

 41 

 43 

 44 

 46 

 47 

 48 

 49 

 50 

 51 

 ' 52 

 52 

 53 

 53 

 54 

 54 

 65 



Feet. 



Feet. 



Feet. 

 5 

 9 

 14 

 19 

 24 

 30 

 35 

 39 

 43 

 47 

 49 

 52 

 54 

 56 

 57 

 58 

 59 

 60 

 61 

 61 

 62 

 62 

 63 

 63 

 63 

 63 

 63 

 64 

 64 



Feet. 



Feet. 



15 



20 



25 



30 



35 



40 



45 



50 



55 



60 



65 



70 



75 



80 



85 



90 



95 



100 



105 



110 



115 



120 



125 



130 



135 



140 



145 



150 



4 

 5 

 5 

 4 

 4 

 4 

 4 

 3 

 3 

 2 

 2 

 2 

 2 

 2 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 

 1 

 



1 

 1 







0.8 

 1.0 

 1.0 

 .8 

 .8 

 .8 

 .8 

 .6 

 .6 

 .4 

 .4 

 .4 

 .4 

 .4 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 ■ .2 

 .2 

 .0 

 .2 

 .0 

 .2 

 .2 

 .0 



3 



4 

 4 

 4 

 4 

 4 

 3 

 2 

 2 

 2 

 2 

 2 

 1 

 2 

 1 

 2 

 1 

 1 

 1 

 1 

 1 

 1 

 

 1 

 



1 







1 



0.6 

 .8 

 .8 

 .8 

 .8 

 .8 

 .6 

 .4 

 .4 

 .4 

 .4 

 .4 

 .2 

 .4 

 .2 

 .4 

 .2 

 .2 

 .2 

 .2 

 .2 

 -.2 

 .0 

 .2 

 .0 

 .2 

 .0 

 .2 



4 

 5 

 5 

 5 

 6 

 5 

 4 

 4 

 4 

 2 

 3 

 2 

 2 

 1 

 1 

 1 

 1 

 1 

 

 1 

 

 1 

 

 

 

 



1 







0.8 

 1.0 

 1.0 

 1.0 

 1.2 

 1.0 

 .8 

 .8 

 .8 

 .4 

 .6 

 .4 

 .4 

 .2 

 .2 

 .2 

 .2 

 .2 

 .0 

 .2 

 .0 

 .2 

 .0 

 .0 

 .0 

 .0 

 .2 

 .0 



In New York balsam fir grows in height at an average rate for all 

 types of 0.4 of a foot a year. 



On flats the growth between the ages of 20 and 45 is nearly 1 foot 

 a year. At 60 years the current annual growth equals the average 

 annual growth, namely 0.4 foot, which indicates that at this age the 

 annual growth begins to decline. At the age of 85 the current an- 

 nual growth is only 0.2 ot a foot, and at 125 years has practically 

 stopped. 



In the swamp the growth in general is slower and on the hardwood 

 slope faster than on the flat, but on the whole it culminates and begins 

 to decline at about the same age m all three types. 



In Maine (Table 11) the average tree grows faster than in New 

 York; namely, at the rate of 0.7 of a foot a year. The period of most 

 rapid growth is longer from the twentieth to the fiftieth year and the 

 total height is greater. 



