willows: their growth, use, and importance. 
13 
diameter growth gain their lead over the average trees during the 
first two decades. By thinning, the diameter growth can be made 
more sustained. 
Table 3 is based on measurements of 34 trees in Arkansas with 
stumps 2.5 to 3.2 feet in diameter and 42 to 63 years old. Soil, a 
rich, moist bottom land. The trees when plotted were divided into 
three classes based on diameter growth. The minimum growth 
given in the table is the average for the slowest growing trees; the 
average growth is for the trees growing at a medium rate and the 
maximum growth is an average for the fastest growing trees. Neither 
the minimum nor the maximum growth is the slowest or fastest 
found for individual trees. 
Table 3. — Diameter growth of black willow, Phillips County, Ark. 
Diameter, breasthigh. 
Increase in diameter 
periods. 
by 5-year 
Age. 
Minimum. 
Average. 
Maximum. 
Minimum. 
Average. 
Maximum. 
Years. 
Inches. 
Inches. 
Inches. 
Inches. 
Inches. 
Inches. 
5 
1.4 
2.6 
3.9 
1.4 
2.6 
3.9 
10 
3.3 
5.6 
7.9 
1.9 
3.0 
4.0 
15 
5.3 
8.5 
11.4 
2.0 
2.9 
3.5 
20 
7.5 
11.1 
14.4 
2.2 
2.6 
3.0 
25 
9.5 
13.5 
17.3 
2.0 
2.4 
2.9 
30 
11.5 
15.6 
19.8 
2.0 
2.1 
2.5 
35 
13.3 
17.5 
22.1 
1.8 
1.9 
2.3 
40 
15.1 
19.4 
24.3 
1.8 
1.9 
2.2 
45 
16.6 
21.2 
26.3 
1.5 
1.8 
2.0 
50 
18.1 
22.8 
28.2 
1.5 
1.6 
1.9 
55 
19.6 
24.3 
29.9 
1.5 
1.5 
1.7 
60 
21.0 
25.7 
31.6 
1.4 
1.4 
1.7 
Table 4 is based on measurements of 76 trees in Mississippi with 
stumps 16 to 34.6 inches in diameter inside bark and 36 to 58 years 
old. Soil, a rich, moist bottom land. 
Table 4. — Diameter growth of black willow, Jefferson County, Miss. 
Diameter, breas thigh. 
Increase in diameter 
periods. 
by 5-year 
Age. 
Minimum. 
Average. 
Maximum. 
Minimum. 
Average. 
Maximum. 
Years. 
Inches. 
Inches. 
Inches. 
Inches. 
Inches. 
Inches. 
5 
1.9 
3.1 
4.9 
1.9 
3.1 
4.9 
10 
3.9 
6.5 
9.0 
2.0 
3.4 
4.1 
15 
5.9 
9.5 
12.6 
2.0 
3.0 
3.6 
20 
7.5 
12.2 
15.9 
1.8 
2.7 
3.3 
25 
9.0 
14.4 
18.7 
1.5 
2.2 
2.8 
30 
10.4 
16.2 
21.4 
1.4 
1.8 
2.7 
35 
11.7 
17.9 
23.8 
1.3 
1.7 
2.4 
40 
13.0 
19.3 
26.0 
1.3 
1.4 
2.2 
45 
14.2 
20.8 
27.8 
1.2 
1.5 
1.8 
50 
15.4 
22.2 
29.3 
1.2 
1.4 
1.5 
55 
16.7 
23.5 
30.7 
1.3 
1.3 
1.4 
60 
17.7 
24.7 
31.8 
1.0 
1.2 
1.1 
