IRRIGATION REQUIREMENTS OF THE GREAT BASIN 
15 
eolation losses. The results, however, may be regarded as typical of 
those resulting from the use of water on the more porous bench lands 
of the Great Basin under the methods practiced 20 years ago. 
Figure 6 shows the quantities of water applied to each of several 
plots of oats, wheat, potatoes, and corn, and the corresponding yields. 
To economize space the mean of the results of plots receiving nearly 
the same quantity of water has been inserted instead of those from 
each plot ; the fig r ures in the column headed " Xo. of Tests " give the 
number of plots or tests, which are included in each case. 
|\8 
WATER APPLIED 
CROP 
YIELD 
Inches in Depth on Land 
OATS 
On Experiment Station 
Farm, Logan, Utah. 
S hallow Sandy soil over 
Gravel. Deep percolation. 
Losses heavy 
Bushels pen Acre 
40 30 20 10 
20 40 60 80 
1 
5 
J 
1 
2 
2 
4 
2 
1 
1 
WHEAT 
Conditions similar 
to those for Oats above 
1 
2 
4 
2 
1 
POTATOES 
Conditions similar 
to those for Oats above 
100 200 300 400 500 
2 
2 
2 
2 
CORN 
Conditions similar 
to those for Oafs above 
20 40 60 80 
3 
^r 
Fig. 6. — Relationship between amount of water applied and crop yield for oats, 
wheat, potatoes, and corn as determined by plot experiments at Logan, Utah, in 
1901 
Largely on account of the shallowness of the soil and the porosity 
of the gravel and cobble subsoil, the site of the experimental plots 
on which the foregoing results were obtained was abandoned at the 
close of the crop-growing season of 1901, and a new site was pur- 
chased about a mile and a half north of the Agricultural College of 
Utah, known as the Greenville farm. The soil of that portion of 
this farm devoted to irrigation experiments consists mainly of sand 
and silt and weighs, on an average, 76 pounds per cubic foot. The 
soil is comparatively uniform in texture, far removed from ground 
water, and of great depth. The maximum water-holding capacity 
under field conditions is about 24 per cent of the dry soil, the most 
favorable percentage of soil moisture for growing crops about 18 
