A Study of Colorado Wheat 
17 
on the plots that did not receive an application of the sodic nitrate 
did not indicate an excessive supply of these salts, nor did it show 
any deficiency, so far as growth and color of the plant may be de¬ 
pended upon as criteria for our judgment. As soon as the crop was 
removed the accumulation of nitric nitrogen took place rapidly and 
the ground was comparable to fallow land, especially as I had it 
double disced and there was at all times an adequate supply of 
moisture. The cropped plots had very nearly overtaken the fallowed 
check by the end of September. The rate of increase in the nitric 
nitrogen or its equivalent amount of sodic nitrate is clearly shown 
in the table just given, from which we see that we have a maximum 
increase of about five-fold from 38.9 to 191.6 pounds of sodic ni¬ 
trate between 1 August and 22 November. 
In my preceding statements concerning the nitric nitrogen, I 
have assumed that a glance at the tables given would suffice to make 
this subject clear, but it may be well to present it in another man¬ 
ner. In the following table I have converted the nitric nitrogen 
into its equivalent amount of sodic nitrate, and given the amount 
found in the first foot and that in the succeeding three feet. We 
did not continue the taking of our samples later than 1 August in 
1913, for we harvested a few days (4 to 6) later, but in 1915 we 
continued the taking of samples till 13 December. 
DISTRIBUTION OF NITRATES IN THE FIRST FOOT AND THE SUCCEEDING THREE 
FEET OF SOIL IN 1913 AND 1915 
Succeed ingr 
Date 
Variety of Wheat 
Section 
First Foot 
Three Feet 
12 May 
1913 
Red Fife 
1800 
254.2 
205.4 
13 May 
1915 
Red Fife 
1800 
124.4 
316.0 
12 May 
1913 
Red Fife 
1900 
150.1 
190.6 
13 May 
1915 
Red Fife 
1900 
115.7 
373.9 
1 Aug. 
1913 
Red Fife 
1800 
71.8 
42.3 
3 Aug. 
1915 
Red Fife 
1800 
29.3 
62.6 
1 Aug. 
1913 
Red Fife 
1900 
62.0 
45.8 
3 Aug. 
1915 
Red Fife 
1900 
19.5 
32.2 
30 Aug. 
1915 
Red Fife 
1800 
42.2 
60.5 
30 Aug. 
1915 
Red Fife 
1900 
50.6 
29.7 
22 Nov. 
1915 
Red Fife 
1800 
89.1 
89.1 
22 Nov. 
1915 
Red Fife 
1900 
73.6 
62.8 
14 Dec. 
1915 
Red Fife 
1800 
103.1 
191.8 
14 Dec. 
1915 
Red Fife 
1900 
121.8 
118.7 
12 May 
1913 
Kubanka 
1800 
186.1 
147.0 
13 May 
1915 
Kubanka 
1800 
117.7 
348.1 
12 May 
1915 
Kubanka 
1900 
142.0 
71.4 
13 May 
1915 
Kubanka 
1900 
117.1 
' 367.9 
1 Aug. 
1913 
Kubanka 
1800 
94.7 
61.2 
3 Aug. 
1915 
Kubanka 
1800 
19.3 
32.5 
1 Aug. 
1913 
Kubanka 
1900 
49.0 
32.4 
3 Aug. 
1915 
Kubanka 
1900 
12.3 
26.6 
30 Aug. 
1915 
Kubanka 
1800 
36.2 
66.0 
30 Aug. 
1915 
Kubanka 
1900 
47.3 
64.8 
22 Nov. 
1915 
Kubanka 
1800 
74.4 
80.0 
22 Nov. 
1915 
Kubanka 
1900 
86.0 
105.6 
14 Dec. 
1915 
Kubanka 
1800 
86.7 
164.8 
14 Dec. 
1915 
Kubanka 
1900 
104.1 
176.64 
