The storage and Use of Soil Moisture 
21 
March to August only 1 per cent of increase is shown in the 
moisture content, During the entire period from harvest to 
seeding date, only 2.5 inches of water were accumulated. The 
rainfall during the period was 12.2 inches, of which 21 per cent 
was retained. Even with this small amount of stored water, this 
field and another that was summer tilled with much the same 
results in 1910. and both sown to winter wheat, were the only 
fields on the Station that produced any small grain in 1911. 
The fourth field shown was in oats in 1910 and summer tilled 
in 1911. An increase of 1 per cent is shown in the moisture con- 
Plat D on left. Summer tilled, 1912 — yield of winter wheat 1913, 26.8 
bushels. Plat C on right. Continuous cropping — yield 2.2 bushels. 
tent. This makes about 3.7 inches of water, which was 23 per 
cent of the rainfall of 15.8 inches. 
The fifth field shown was in spring wheat in 1910 and summer 
tilled 1911. This field shows an increase of only 1.3 per cent of 
moisture during the summer. This is only 1.25 inches of water 
out of a total of 12.1 inches, or only 10 per cent of the rainfall. 
The last field shown in the tables was in winter wheat in 
1911 and summer tilled in 1912. The first sampling was made 
some considerable time after the field had been disked, and just 
after a rain of an inch, which was caught and retained in the 
upper two feet. Between the first and last sampling about 1.5 
