20 
Indian Forest Records. 
[Vol. HI. 
The figures for exploitable age (rotation) and girth in Appendix 
III are those actually given in the working- 
Exploitable age ami girth. thftt ^ ftfter allowing for thickness 
of bark and for the time taken for a seedling to establish itself. As a 
general rule the exploitable girth limit in Burma has been fixed at 7 
feet, with a reduction to 6 feet in the case of poor localities where teak 
does not reach large size. It is, however, a question whether the 
exploitable girth should not be raised in certain accessible localities 
where sound teak of large dimensions can be grown. 
With a very few exceptions the exploitable age, for a girth of 7 feet, 
has been fixed at 150 to 180 years, that is, allowing for the establishment 
of the seedling and other contingencies. The only exceptions are to be 
found in the Kangyi and the Satpok, Sitkwin and Thindawyo reserves 
(120 years each), the Kyaukmasin reserve (196 years) and the Ziyaing- 
Mehaw reserves (200 years). These are referred to again below. 
2. Statistics regarding Bate of Growth in Girth. 
(1) Growth up to 7 feet in girth. 
The average rate 
Averages. 
of growth in girth of natural teak for the whole 
of Burma, and a few of the fastest and 
slowest average rates of growth respectively 
for separate forests, are as follows :— 
AGE AND MEAN ANNUAL GIRTH INCREMENT (IN INCHES) FOR 
_ 
Particulars. 
3 
'0" 
Acto 
| 
Mean 
annual 
incre¬ 
ment. 
Average for Wiiole of Burma. 
58 
*621 
Fastest growth (average for 
WHOLE FOREST). 
Kangyi . • • • 
Satpok,Sitkwin and Thindawyo . 
50 
50 
I 
•720 
•720 
Slowest growth (average for 
WHOLE FOREST). 
Minbyin (dry forest only) 
Kyaukmasin . 
Ziyaing and Mehaw 
Pozaungdaung (dry forest only) 
Hintha Working Circle 
78 
75 
62 
69 
64 
•461 
•480 
•581 
•522 
•562 
GIRTH OF 
4' 
6" 
6' i 
0" 
7 
'0' 
Age. 
Mean j 
annual j 
incre¬ 
ment. 
Age. 
j 
Mean 
annual 
incre¬ 
ment. 
Age. 
Mean 
annual 
incre¬ 
ment. 
90 1 
•600 
130 
'554 
155 I 
•542 
65 
'831 
85 
•847 
110 
•764 
70 
•771 
90 
•800 
| 110 
| 
•764 
116 
•466 
161 
•447 
1 
186 
1 *452 
114 
•474 
155 
•465 
i 186 
•452 
112 
•482 
153 
•471 
190 
- 442 
110 
•491 
165 
•436 
•• 
108 
•500 
l 152 
•474 
I 189 
| 444 
[20] 
