56 
Research Bulletin No. 5 
Table 22. — Effect of weeds on soil moisture, 1907. 
PER CENT MOISTURE IN THE SOIL. 
Depth 
June 15 
July 3 
August 23 
September 21 
Where weeds 
were growing 
Feet 
1 
2 
3 
Average .... 
16.9 
17.9 
16*6 
11.9 
15.0 
14^9 
8.7 
11.9 
12^7 
9.5 
o.o 
8.0 
17.1 
13.9 
11.1 
8.6 
No weeds 
1 
2 
3 
Average .... 
19.2 
19.1 
15.7 
18.7 
17.0 
16.5 
17.9 
17.7 
15.7 
17.2 
16.3 
15.9 
18.0 
17.4 
17.1 
16.5 
Table 23. — Effect of weeds on soil moisture, 1908. 
PER CENT MOISTURE IN THE SOIL. 
co be 
CP.S 
£ o 
2 & 
CP 
a 
CP 
M 
Depth 
Feet 
1 
2 
3 
4 
5 
6 
Average. . 
1 
2 
3 
4 
5 
6 
Average 
May 22 
17.1 
18.3 
16.9 
11.2 
10.8 
11.7 
14.3 
20.8 
20.0 
17.0 
15.1 
12.8 
11.7 
16.2 
June 29 
14.6 
11.0 
11.9 
9.6 
10.0 
11.9 
11.5 
20.4 
20.9 
18.0 
17.5 
16.0 
14.2 
July 31 
12.0 
9.3 
9.1 
9.0 
7.8 
9.7 
9.5 
18.7 
18.1 
17.0 
16.5 
15.2 
13.7 
16.; 
August 18 
9.0 
8.1 
7.6 
8.5 
8.3 
9.2 
8.5 
16.6 
16.4 
15.3 
15.3 
15.2 
13.8 
15.4 
October 29 
16.0 
14.0 
8.1 
7.9 
7.6 
8.3 
10.3 
21.3 
17.9 
15.0 
14.4 
13.7 
13.9 
16.0 
The plats from which the data given in Table 22 were ob- 
tained were treated alike until the first of June. At this date 
weeds were starting on both plats. They were allowed to grow 
on one plat, while the other one was cultivated and kept clean. 
More than three and one-half inches of water were lost from the 
upper three feet of soil where weeds were grown as compared 
with that kept clean. The soil was as dry as it would have been 
