A Study oe Colorado Wheat 
15 
was very much greater in the first than in the second sample. 
While we do not know with certainty, it is very probable that the 
difference in distribution of the nitric nitrogen is due to a difference 
in the time of development, the supply of water and the permea¬ 
bility of the soil; the two latter factors facilitating the downward 
movement of the nitrates. 
A second set of three samples was taken in the same manner 
as those already given on 27 June, twelve to fourteen days after 
we irrigated the field. The total nitrogen was also determined in 
this set of samples. 
SAMPLE No. 1—27 JUNE, 1913. 
Nitric 
Nitrogen Total 
Depth. 
Moisture 
Parts per 
Nitrogen 
Percent 
Million 
Percent 
0 
to 
12 
inches.. 
_ 16.88 
4.49 
0.1292 
13 
to 
24 
inches.. 
_ 16.70 
0.95 
0.0653 
25 
to 
36 
inches.. 
. . . 15.97 
0.54 
0.0340 
37 
to 
48 
inches.. 
... 18.11 
0.54 
0.0258 
49 
to 
60 
inches.. 
_ 19.87 
0.39 
0.0177 
61 
to 
72 
inches.. 
... 19.86 
0.27 
0.0218 
73 
to 
84 
inches.. 
... 18.05 
0.68 
0.0218 
85 
to 
96 
inches.. 
... 21.40 
0.38 
0.0218 
97 
to 
108 
inches.. 
... 18.84 
0.00 
0.0218 
109 
to 
120 
inches.. 
... 18.63 
0.00 
0.0218 
121 
to 
132 
inches.. 
... 17.96 
0.00 
0.0218 
SAMPLE 
No. 2.-27 
June, 1913. 
Nitric 
Nitrogen 
Total 
Depth. 
Moisture 
Parts per 
Nitrogen 
Percent 
Million 
Percent 
0 
to 
12 
inches.. 
. . . 15.96 
2.04 
0.1142 
13 
to 
24 
inches.. 
... i 6.49 
0.95 
0.0571 
25 
to 
36 
inches.. 
... 16.41 
0.68 
0.0313 
37 
to 
48 
inches. . 
... 17.07 
0.39 
0.0204 
49 
to 
60 
inches.. 
... 18.78 
0.39 
0.0204 
61 
to 
72 
inches.. 
... 20.15 
0.39 
0.0204 
73 
to 
84 
inches.. , 
... 20.04 
0.68 
0.0231 
85 
to 
96 
inches.. 
... 20.23 
1.22 
0.0299 
97 
to 
108 
inches. . 
... 14.78 
0.68 
0.0177 
109 
to 
120 
inches.. 
... 18.14 
0.68 
0.0150 
121 
to 
132 
inches.. 
. . . 19.75 
0.68 
0.0218 
SAMPLE 
No. 3—27 
JUNE. 1913. 
Nitric 
Nitrogen 
Total 
Depth. 
Moisture 
Parts per 
Nitrogen 
Percent 
Million 
Percent 
0 
to 
12 
inches... 
. . . 14.39 
3.13 
0.1115 
13 
to 
24 
inches.., 
... 15.54 
1.22 
0.0530 
25 
to 
36 
inches... 
... 15.61 
0.95 
0.0326 
37 
to 
48 
inches... 
. . . 16.09 
0.68 
0.0231 
49 
to 
60 
inches... 
... 17.60 
0.54 
0.0204 
61 
to 
72 
inches... 
... 19.06 
0.54 
0.0163 
73 
to 
84 
inches... 
... 18.41 
0.39 
0.0177 
85 
to 
96 
inches... 
. . . 19.23 
0.68 
0.0258 
97 
to 
108 
inches... 
. . . 19.84 
p.95 
0.0109 
