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a2 BULLETIN 1493, U. S. DEPARTMENT OF AGRICULTURE 
-TasLe 2.—Yield per acre in fully stocked stands of Douglas fir, gross saw timber 
volume, of trees 12 inches and over, Scribner rule 
Quality of land 
Age of 
r stand 
Excellent Good Fair 
Years | Board feet | Board feet | Board feet 
10 
20 AQQ. S22 woe Soe oe EE eter ae 
40 24, 400 11, 900 4, 500 
60 62, 000 42, 800 23, 800 
80 92, 500 70, 009 45, 700 
100 115, 100 90, 400 62, 800 
120 131, 100 105, 100 75, 000 
Expressed in cubic feet or in cords or as linear feet of round timber, 
the possible yields would be even more promising, for the volume of 
small timber expressed in board feet is misleading. The volume, 
in cubic feet, of the stems (exclusive of bark) of all the living trees 
in the stand (but not thinnings) is given in Table 3. 
TABLE 3.—Yveld per acre in fully stocked stands of Douglas fir, gross cubic-foot 
volume, of all the trees 
Mas 
| Quality of land , 
Excelient Good Fair 
Years Cubic feet | Cubic feet Cubic feet 
20 1, 830 1, 550 1, 256 
40 7, 500 6, 550 5, 250 
60 12, 500 10, 860 S, 700 
80 16, 350 14, 220 11, 350 
100 19, 140 16, 610 13, 270 
120 21, 090 18, 340 14, 600 
In view of the advancing values of standing timber and the prices 
now prevailing in the older forest regions, it seems reasonable to 
expect that by the time the next crop of Douglas fir is merchantable 
its stumpage value may easily be three times present values. This 
should be taken into account in converting volume yield to a money 
basis. Also, the yield from thinnings, when it is economically 
possible to make them, will give a substantial addition to the prospec- 
tive returns. 
COsTtTs 
In the preceding pages requirements essential for keeping forest 
land reasonably productive have been recommended, but only after 
a thorough weighing of the cost of each requirement, and with the 
intent to classify as essential only those which will give the largest 
benefits for the money invested. This bulletin would not be com- 
plete without some attempt to state the cost of these measures. 
Estimates of these costs are very likely to be misleading, so varied 
are conditions in different districts. It may cost much more on 
one tract to reach the standard degree of security against fire than 
on another. The estimates here given, therefore, should be consid- 
ered as very broad averages for the region as a whole. They are the 
estimated costs of carrying out the above-recommended requirements 
e THERE hr eI tii sth 0 
