52 
BULLETIN 316, U. S. DEPARTMENT OF AGRICULTURE. 
The returns from willows planted now may be more fairly estimated 
on the basis of what the best plantations of the past have done rather 
than the averages, because the average plantations represent a great 
amount of poor practice that may. now be avoided. The following 
yields are for groves whose appearance and history show that they 
have been treated in a rational manner: 
Table 21. — Yield of selected willow groves in Iowa. 
Plot No. 
Size of 
plot. 
Age. 
Yield 
per acre. 
Yield 
per acre 
per year. 
Location. 
1 
Acres. 
0.25 
.25 
.25 
.25 
.25 
.25 
.25 
.25 
.25 
.25 
.25 
.25 
Years. 
11 
16 
16 
18 
18 
21 
21 
22 
24 
25 
25 
31 
Cords. 
47.3 
76.8 
62.4 
109.8 
81.0 
109.2 
73.5 
116.6 
132.0 
105.0 
95.0 
102.0 
Cords. 
4.3 
4.8 
3.9 
6.1 
4.5 
5.2 
3.5 
5.3 
5.5 
4.2 
3.8 
3.3 
2 
Do. 
3 
Do. 
4 
Do. 
5 
Do. 
6 
Do. 
7 
Do. 
81 
Do. 
9 
Do. 
10 
Upland. 
Do. 
11 
12 
Do. 
4.5 
Illinois Agricultural Experiment Station. 
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