LONGLEAF PINE 
23 
is in common use in the South — and the difference is striking. Tabu- 
lated information of this kind will be found useful in predicting 
the amount of growth that may be expected to take place during a 
specified period — five years or multiples thereof — upon different 
qualities of situation or classes of land. On medium land, for ex- 
ample, well-stocked longleaf stands at 40 years of age have been 
found containing an average of 6,200 board feet, and these may be 
expected to grow 4,200 board feet during the next 10 years, at which 
time they will contain a total of about 10,400 feet. On good land, 
or favorable situations, measured 40-year-old stands, well stocked 
with trees, have contained an average of about 11,000 board feet, 
increasing during the next 10 years by about 5,200 board feet, to a 
total of 16,200 feet at 50 years of age. The caution is here repeated 
that these are fully stocked stands and very much better than the 
average (PI. VI). The degree of stocking, or the amount of un- 
used space in the stand, should be taken fully into account in esti- 
mating any piece of timber. 
Table 10. — Amount of saw timber {in hoard feet), per acre, grown in longleaf 
pine stands of even age, well stocked with trees 
Age 
of 
stand 
Mill scale, or actual cut 
Doyle rule 
Trees 10 inches and over in 
diameter 
Trees 8 inches and over in 
diameter 
Trees 7 inches and over in 
diameter 
Better 
land 
Medium 
land 
Poorer 
land 
Better 
land 
Medium 
land 
Poorer 
land 
Better 
land 
Medium 
land 
Poorer 
land 
Years 
30 
35 
40 
45 
50 
55 
60 
65 
70 
Board 
feet 
5,900 
8,500 
11,000 
13, 600 
16, 200 
18, 800 
21, 400 
23, 700 
25, 800 
Board 
feet 
1,200 
3,800 
6,200 
8,400 
10,400 
12, 400 
14, 400 
16, 200 
17, 900 
Board 
feet 
Board 
feet 
10, 800 
14,200 
17, 100 
19, 600 
21,800 
23, 700 
25, 300 
26, 900 
28, 400 
Board 
feet 
5,700 
8,200 
10, 400 
12, 600 
14, 400 
16,000 
17,400 
18, 800 
20, 200 
Board 
feet 
700 
2, 200 
3,800 
5,300 
6,900 
8,200 
9,500 
10, 700 
11,900 
Board 
feet 
3,500 
4,800 
6,200 
7,600 
9,000 
10, 300 
11,600 
12, 900 
14, 200 
Board 
feet 
1,900 
2,900 
4, 000 
5, 000 
6, 100 
7,200 
8, 200 
9,200 
10, 200 
Board 
feet 
300 
1,000 
1,700 
2,500 
3,200 
4,000 
4,700 
5,500 
6, 200 
1,500 
3,100 
4,600 
6, 100 
7, 500 
8,800 
10,000 
The final yields here shown, it should be noted, are the full con- 
tents of the stand at the assigned ages and do not include timber 
that may have been produced previously, or the intermediate yield, 
often a very considerable amount. This intermediate yield is the 
product of any thinnings that may have been made (see under " Cut- 
ting," p. 30) and of the timber that has died out during the life of 
the stand. AYith advance in the age and size of the trees there comes 
a natural reduction in the number of trees by the weaker giving way. 
The process may be observed in any well-stocked stand in which are 
found dominant trees, others that are barely living, and still others 
that have died for lack of overhead light, soil moisture, or root space. 
If these trees are cut and utilized, the total yield of the stand is 
considerably increased, and the stand is made more profitable. 
The following facts concerning a few of the stands actually 
measured (see Table 11) will serve as illustrations of what may be 
