ROTATIONS FOR PINES. 51 
or increase the cost of present operations. The smaller the area the 
smaller the invested capital and the yearly tax list, and in the long 
run this means the saving of a considerable sum of money. 
In Table X XVI is shown the amount of land necessary for a sus- 
tained annual yield under different rotations and diameter limits. It 
is seen that the smallest amount of land is needed when a 16-inch 
diameter limit and a 40-year rotation are adopted. As previously 
stated, if any rotation is adopted longer than the one when a cut equal 
to the present can again be obtained, the tract, when cut over for the 
first time, will not furnish enough pine to supply the mill. If 14 
inches is cut to, it is thought that the cypress and hardwoods, combined 
with the added volume of stands of pine not coming under the ax for 
some time, will furnish enough extra material to give the mill (com- 
bined with the present stand of pine) a 30 years’ cut, but possibly not 
enough to give a 40 years’ cut if 16 inches is cut to. Since it is not 
advisable to buy the large amount of logs that would be needed to 
give the mill a 40 years’ cut, the 16-inch diameter limit and 40-year 
rotation are impracticable. Cutting to 14 inches with a 30-year rota- 
tion, while requiring more land for a sustained annual yield, will give 
a larger present cut per acre and will not necessitate buying logs to 
supply the mill before a full yield can again be obtained from the 
lands first logged. To secure the same output during the next thirty 
years, or the period which must elapse before the second cutting 
begins, the difference between 4,729 board feet and 8,293 board feet 
per acre for the number of acres to be cut annually must be secured 
in addition. The growth which will accrue to stands of pine which 
are not to be cut for some years will partly supply this deficiency, and 
the cypress and such hardwoods as can be disposed of will suffice to 
make up the rest. This rotation and diameter limit are therefore rec- 
ommended for all pine lands controlled by the EK. P. Burton Lumber 
Company. 
TaBLeE XX VII.—Sustained annual yields of pine, with a 14-inch diameter breasthigh 
cutting limit and a rotation of 30 years. 
| Time re- 
| | Time re- | quired be- | Total area ee 
Sustained Annual |Atea to be| quired to fore second) necessary tie q 
annual yield yield per logged an-| cutover l|yield equal) forsus- | Tet oak 
of tract. cca sh muadly, present to ast can | tained an- j.tod a1 
tract. be ob- | nual yield. ami = 
aed | /nual yield. 
“Board Jeet. Bd. ft. Acres. | Years Years | Acres. Acres. 
20, 000, 000 8, 293 2, 412 16.5 30 | 72,360 | 32,660 
30, ; 8, 293 3, 618 11.0 30 | 108,540 | 68, 840 
40, 000, 000 8, 293 
| 
| 
4, 823 | 8.2 | 30 144,690 | 104,990 
| 
