Part I.] 
Troup : Teak Forests of Burma. 
21 
As far as individual trees go, the following are the maximum and 
Maximum and minimum minimum rates of growth recorded:- 
rate of growth. 
Age for girth of 
Mean 
annual 
Particulars. 
3' 0" 
1 
4' 6" 6' 0" i 
r o" 
girth in¬ 
crement 
(inches). 
Remarks. 
Maximum. 
1 
Ngalaik Reserve, Pyinmana 
Division, compartment 
No. 19 
14 
23 30 
42 
2-00 
Alluvial land : no 
bamboos. 
Minimum. 
Sinthe Reserve, Pyinmana Divi¬ 
sion, compartment No. 45 . 
163 
211 | 300 
357 
I -240 
I 
1 
Spur, loam : bamboo 
D endrocalamus 
strictus. 
A stump showing slower growth than the minimum above-mentioned 
is recorded in compartment 78 of Minbyin reserve, where an age of 332 
years corresponds to a r girth of 6 feet 5 inches, representing a mean 
annual girth increment!pf '232 inches, and giving an equivalent age of 
362 years for a girth of 7 feet : this stump, however, was that of an 
injured tree, and the figures cannot therefore be accepted as represent¬ 
ative. 
Unfortunately many of the working-plans contain no reliable figures 
showing the girth increment of individual trees, so that the above maxi¬ 
mum and minimum figures for individual trees are not based on data 
obtained from all working-plans. Figures obtained by Pressler’s borer, 
for instance, are of no use so far as the whole life of a tree is con¬ 
cerned. 
(2) Growth above 7 feet in girth. 
Figures showing rate of growth of teak trees over 7 feet in girth are 
available only from a few working-plans, namely, up to 12 feet for Yeni, 
Yonbin and Yanaungmyin up to 11 feet for East Yoma, up to 10 feet 
for Minbyin, up to 9 feet for Kale, and up to 8 feet for Rangoon Hills, 
South Zamavi and Lower Thaungyin. A combination of the results 
[ 21 ] 
