140 DRY-FARMING 
by deep fall plowing and by proper summer fallowing 
for the conservation of moisture, the loss of moisture 
by direct evaporation from the lower soil layers 
need not be larger than from finer grained soils. 
Thusagain are emphasized the principles previously 
laid down that, for the most successful dry-farming, 
the soil should always be kept well filled with mois- 
ture, even if it means that the land, after being broken, 
must lie fallow for one or two seasons, until a suffi- 
cient amount of moisture has accumulated. Further, 
the correlative principle is emphasized that the mois- 
ture in dry-farm lands should be stored deeply, away 
from the immediate action of the sun’s rays upon the 
land surface. The necessity for deep soils is thus 
again brought out. 
The great loss of soil moisture due to an accumu- 
lation of water in the upper twelve inches is well 
brought out in the experiments conducted by the 
Utah Station. The following is selected from the 
numerous data on the subject. Two soils, almost 
identical in character, contained respectively 17.57 
per cent and 16.55 per cent of water on an average 
to a depth of eight feet; that is, the total amount of 
water held by the two soils was practically identical. 
Owing to varying cultural treatment, the distribu- 
tion of the water in the soil was not uniform; one 
contained 23.22 per cent and the other 16.64 per 
cent of water in the first twelve inches. During 
the first seven days the soil that contained the 
