IRRIGATION IN NORTHERN COLORADO. 
61 
water applied and the trend of the curves was governed by points 
determined by taking the arithmetical average of the coordinates 
A 
3 
b 
1l 
z 

U 
J 2 
a 
a 
< 
I 
It 
ill 
a 
\ 
\ 
1 
J 
5 8 10 IS 14. 16 
VIETUD IN TONS PER ACRE 
Fig. 12, 
-Irrigation of sugar beets. Relation between the depth of water 
plied and the yield. 
of points within each half foot of depth. No satisfactory way was 
found to weight the points to take care of the difference in the area 
of the fields from which the 
unit value was determined, and 
for this reason the curves should 
be considered only as very close 
approximations of averages for 
the valley. 
In Tables 9, 17 to 18, and 29 
are given all the detailed records 
of farm irrigation for the two 
years of the investigation, with 
footings which summarize the 
data for each crop each year. 
The averages in the footings 
are true averages, 
k3 
J* 1 
>4 
4 

200 300 
YIELD IN BUSHELS PER ACRE 
400 
involving 
Fig. 13. — Irrigation of potatoes, Rela- 
tion between the depth of water ap- 
plied and the yield. 
