42 WORKING PLAN, FOREST LANDS IN SOUTH CAROLINA. 
annual growth in height for the first fifty years is about 11.5 inches, 
and for the first century about 8.8 inches. 
The Cuban and Loblolly pines, like the Longleaf, vary greatly in 
rate of growth under different conditions. The Cuban Pine attains 
its maximum annual growth in height—18 inches—by the thirtieth 
year. By the fiftieth year the annual growth has fallen to 12 inches, 
and by the hundredth year to 3.6 inches. The mean annual growth 
in height for the first fifty years is 16 inches. For the first century it 
is about 11 inches. 
The height growth of Loblolly Pine is very rapid at first. Between 
the tenth and twentieth years the annual growth is 30 inches. It then 
falls off rapidly. By the fiftieth year it has sunk to 12 inches, and by 
the hundredth year to 1.2 inches. The mean annual growth for the 
first fifty years is 21.4 inches; for the first century, 12.6 inches. 
The following table and diagram (10) show the diameter at breast 
height of Longleaf, Cuban, and Loblolly Pine for successive ten-year 
periods from 10 to 240 years: : 
TABLE 16.—Diameter breasthigh on a basis of age. 




| Age. | Longleaf} Cuban | Loblolly Age. | Longleaf, Cuban Loblolly 
Pine. Pine. | Pine. Pine. Pine. Pine. 
| 
Years. Inches. Inches. | Inches. Years. | Inches. Inches. Inches. 
LO! pee ess | meee ieee eerss HO) Dae eSB 23.3 
20 3.4 4.0 6.2 120 SO) 19.2 24.2 
30 5.0 Goat eh Onp 130 152 Reh SOO. 25.0 
40 6.4 Bas al pee oe ion] eee 16.4 20.9 25.7 
50 tests) 10.4 | 15.2 || 150 ilepak BANE T(E: 26.5 
60 8.9 ie Mad Pe | 160 IW joa hana 2542! 27.3 
70 10. 0 UBS 7( 9) 19.0 || 170 18.5 PARAL 28.0 
80 Ua AGL 15.0 20. 4 180 1952 PET! 28.7 
90 | 12.2 Die oes 190 19.9 24.4 29,4 
100 ieyy 173 22.4 200 20.5 25.0 30. 2 





The rate of growth in diameter of Longleaf Pine is slow compared 
with the other pines. Assuming a future cutting limit of 12 Inches in 
diameter breasthigh, Longleaf Pine becomes merchantable at an age 
of 90 years, Cuban Pine at 60 years, and Loblolly Pine at 38 years. 
For the first one hundred years Longleaf Pine grows in diameter 
at the rate of 1 inch in seven and one-half years, Cuban Pine at the 
rate of 1 inch in six years, and Loblolly Pine at the rate of 1 inch in 
four and one-half years. 
On situations suited to its growth, Loblolly Pine should be favored 
in the cutting wherever it contends for possession of the ground with 
the other pines. This working plan recommends that, in lumbering, 
the trees be marked by a forester for removal. The diameter limits 
recommended are not to be rigidly adhered to; on the contrary, the 
forester will raise or lower the limit according to the silvicultural con- 



