Relation of Xonavailable Water to Hygroscopic Coefficient 119 
Table 35. — Moisture conditions in a young locust grove near 
Madrid, Nebraska, on April 20, 1911. 
ueptn 
in feet 
Total water 
.Hygroscopic 
coefficient 
\\ uting 
coefficient 
Free water 
"Water 
available for 
growth" 
Per cent 

Per cent 
Per cent 
1 
13.7 
9.8 
14.4 
3.9 
—0.7 
2 
11.8 
10.5 
15.4 
1.3 
—3.6 
3 
10.4 
8.2 
12.0 
2.2 
—1.6 
4 
9.8 
7.5 
11.0 
2.3 
—1.2 
5 
8.5 
7.0 
10.3 
1.5 
—1.8 
6 
7.9 
7.2 
10.5 
0.7 
—2.6 
7 
8.0 
7.3 
10.7 
0.7 
—2.7 
8 
8.1 
7.1 
10.4 
1.0 
—2.3 
9 
8.3 
6.7 
9.8 
1.6 
—1.5 
Table 36. — Moisture conditions in an abandoned' olive orchard 
near Casa Grande, Arizona, October 6, 1911. 
Depth 
Total water 
Hygroscopic 
coefficient 
Wilting 
coefficient 
Free water 
"Water 
available for 
growth" 
Per cent 
Per cent 
Per cent 
1 to 4 in. 
10.3 
6.0 
8.8 
4.3 
1.5 
7 to 12 in. 
6.2 
6.9 
10.1 
—0.7 
—3.9 
13 to 18 in. 
6.8 
7.2 
10.6 
—0.4 
—3.8 
19 to 24 in. 
8.5 
9.0 
13.2 
—0.5 
—4.7 
3d foot 
13.4 
13.8 
20.2 
—0.4 
—6.8 
4th foot 
9.3 
10.6 
15.6 
—1.3 
—6.3 
5th foot 
7.8 
8.1 
11.9 
—0.3 
—4.1 
6th foot 
6.9 
7.5 
10.0 
—0.6 
—3.1 
below the wilting coefficient. In the other two instances trees 
were alive while their roots occupied subsoil with a moisture 
content much below the wilting coefficient. 
SUMMARY AND CONCI/CJSIONS. 
Water-tight cylinders, 6 feet long and holding about 100 
pounds of soil, were either filled with dry soil, saturated with 
water, and drained before sealing at the bottom, or filled with 
soil already containing the desired amount of moisture. These 
were removed to a greenhouse, seeds of wheat, milo, beans, or 
maize planted in the moist surface soil, and no more water 
added, the resulting plants being allowed to grow until they ma- 
tured normally or died. Upon the death of all the plants in a 
cylinder it was opened, both the total and the free water in 
each 3-inch section of soil determined, and the distribution of 
