V ote on the Utilization of Bamboo. 49 
Part V.] Pearson : f 
(6) Outturn. 
A considerable number of iBamboos are extracted annually from the 
Okkan Reserve, the figures for the last five years being as follows :— 
Year. No. of bamboos. 
1905- 06 . 548,600 
1906- 07 . 487,100 
1907- 08 . 660,000 
1908- 09 . 700,000 
1909- 10 . 610,000 
Average . 601,140 
So as to obtain a more reliable figure of outturn, based«on the 
enumerations and weighings carried out in the various bamboo sample 
plots, it has been decided to take the figures obtained not only from 
countings in the Hlaing Yoma and Okkan Reserves of the Rangoon 
Division, but also those obtained from the sample plots in the Thonze 
Reserve of the Tharrawaddy Division. Though these three reserves lie 
in two different Divisions for administrative purposes, they form one 
continuous belt of forests in the Pegu Yoma, in which the species and 
mode of growth of the bamboos is for all purposes the same. 
The combined bamboo area of the Hlaing Yoma and Okkan Reserves 
is 108,364 acres. Portions of these areas contain no bamboos, such as 
Taungya areas, roads, river beds, and scarps, while areas also exist from 
which the extraction of bamboos would be too difficult and costly,so that, 
for safety’s sake,we may reduce it by 20 per cent, leaving 86,700 acres of 
productive bamboo forest to be dealt with. From Appendix I it will be 
seen that the forest can yield 8,254 lbs. of dry internodes of Cep halos- 
tachyum pergracile (Tinwa) and 9,255 lbs. of dry internodes of Bambusa 
polymorpha (Kyathaung) per acre, or a total of 17,509 lbs. or 7*81 tons 
per acre. Thus the gross yield of pulpable material works out at 676,527 
tons or, working on a 5-year rotation, the sustained yield of dry inter- 
nodes comes to 135,305 tons per annum. 
[ 206 ] e 2 
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