50 
TaBLeE XX VI.—Comparison of rotations for sustained annual yield of 20,000,000 board 
feet of pine. 
WORKING PLAN, LANDS IN BERKELEY COUNTY, 8. C. 
| Time required to Area neces- 
Cutting Yield per aaa Mineo es cut over present |sary for sus- 
limit, | Rota. | Present | acre sec- | tract. tained an- 
diameter ell yield per| ond time | nual yield 
breast- “} acre. tractis | First | Second First S q |Secondtime 
high. logged. time land|timeland) 5 eae land 
|is logged.) is logged. . = is logged. 
— = | ; 
| 
Inches. | Years. Bad. ft. Bad. ft. Acres. | Acres. Years Years. Acres. 
10 31 6, 033 6, 033 3, 315 3,315 12.0 12.0 102, 765 
| 10 30 6, 038 5, 758 3,315 3,473 | 12.0 11.4 , 104,190 
10 40 6, 033 8, 143 3,315 | 2,456 12.0 L622) | 98, 240 
12 25 5, 385 5, 385 Syl 3) 3, 714. 10.7 107 92, 850 
12 30 5, 885 6, 566 3,714 | 3,046 10.7 13.0 | 91, 380 
12 40 5, 385 9, 362 SA 2136 10.7 18.6 | 85, 440 
14 22 A120) Wea t2o LA all tS OA | 9.4 9.4 93, 038 
14 30 4,729 | 8,298 BO | me A 9.4 16.5 72, 360 
14 40 4, 729 11, 086 4,229 | 1,804 9.4 Pn) 72, 160 
16 22 4, 021 4, 021 4,974 | 4,974 8.0 8.0 109, 428 
16 30 4, 021 7, 697 4,974 | 2,598 8.0 15.3 77, 940 
16 40 4,021 | 11,968 4,974 1, 671 8.0 23.8 66, 840 
THE ROTATION FOR PINES. 
By rotation is understood the number of years that must elapse 
between the harvesting of successive crops on a given area. 
In Tables X XITI, XXIV, and X XV it is shown that if the land is 
reworked at the time when a cut equal to the present can again be 
obtained, cutting to 14 inches will permit an earlier second cut, and 
necessitate the buying of only a few more acres of land to furnish a 
sustained annual yield than if a 12-inch diameter limit is adopted, and 
much less than is required if a 10 or 16 inch limit is used. Though 
either a 12 or 14 inch diameter limit, with a rotation of twenty-five 
years in the first case and of twenty-two years in the second case, 
would be satisfactory, there are reasons why a longer rotation should 
be adopted. 
When a tract is put under forest management it is assumed that it 
is to be kept in timber for all time and that a certain amount of timber 
is to be taken from it each year to supply a steady demand. Forest 
management aims, by fire protection and careful lumbering, to bring 
about normal conditions in the forest and make each acre produce to 
its utmost capacity. The stand of timber on the lands of the E. P. 
Burton Lumber Company is not at present normal; as a consequence 
of repeated forest fires the yield is too small. If enough land is bought 
to give a sustained annual yield of 20,000,000 board feet and the area 
is cut over when a crop equal to the present can again be obtained, 
the stand per acre will be smaller than if a longer rotation were 
adopted, the area lumbered annually will be larger (which means 
greater expense for railroad and hauling), and more land will have to 
be purchased to supply the yearly demand. 
The object should be to get a sustained annual yield from as small 
an area as possible, provided this does not materially interfere with 
