58 
/'('search Bulletin No. 5 
are being listed to corn. Where the weeds have been killed by a 
previous disking or other cultivation, the soil is in much better 
condition to list than where the weeds are growing. In seasons 
of more rainfall, the difference is less evident because frequent 
rains supply the water used by the weeds from the soil near 
the surface. 
Table 25. — Effect of weeds on soil moisture, 1912. 
PER CENT MOISTURE IN THE SOIL. 
Depth 
April 15 
July 4 
Xovember 5 
Where weeds were 
allowed to grow 
Feet 
1 
2 
3 
4 
5 
6 
Average 
16.0 
14.5 
9.0 
14.5 
6.5 
6.5 
6.1 
7.0 
6.9 
12.6 
9.5 
7.3 
6.1 
6.6 
6.8 
13.2 
7.9 
8.2 
I 
16.0 
13.1 
14.3 
* c 
2 
14.7 
12.4 
14.5 
ll 
3 
9.9 
13.1 
13.8 
4 
10.0 
14.0 
5 
13.5 
14.4 
a> ^ 
6 
8.6 
14.6 
Wh 
Average .... 
13.5 
11.8 
14.3 
The data given in Table 25 were obtained from a test made 
where a small tract of land which had been fall plowed was 
allowed to become weedy. Another portion was kept cultivated. 
The plat where the weeds were kept down contained almost six 
inches more water at the close of the test than the weedy plat. 
Table 26. — Effect of weeds on soil moisture. 
PER CENT OF WATER IN THE SOIL, JUNE 23, 1913. 
Depth 
Soil free from weeds 
Weeds growing 
Loss by weeds 
I dies 
1-6 
20.6 
8.8 
11.8 
7-12 
18.4 
8.7 
9.7 
13-18 
17.0 
9.1 
7.9 
19-24 
11.4 
9.1 
2.3 
25-30 
8.5 
8.2 
31-36 
8.4 
8.0 
