The Fixation oe Nitrogen in 
Colorado Soils 
23 
Hole No. 2. 
Hole No. 5. 
Nitric 
Total 
Nitric 
Total 
Nitrogen 
Nitrogen 
Chlorin 
Nitrogen 
Nitrogen 
Chlorin 
1 
to 
3 
inches.. . . 4.5 
693.2 
206.1 
28.0 
632.4 
123.7 
4 
to 
7 
inches.. . . 1.5 
401.2 
206.1 
24.0 
508.2 
1,154.5 
8 
to 
19 
inches.... 0.5 
435.2 
313.3 
2.5 
557.6 
395.1 
20 
to 
31 
inches.... 16.0 
326.4 
387.6 
Trace 
476.0 
296.8 
32 
to 
43 
inches. . . . 20.0 
312.8 
321.6 
2.0 
448.8 
123.7 
44 
to 
55 
inches. . . . 24.0 
244.8 
123.7 
2.5 
455.6 
230.9 
Hole No. 3. 
Hole No. 6. 
Nitric 
Total 
Nitric 
Total 
Nitrogen 
Nitrogen 
Chlorin 
Nitrogen 
Nitrogen 
Chlorin 
1 
to 
3 
inches.... 3.0 
693.6 
123.7 
18.0 
843.2 
371.1 
4 
to 
7 
inches.. . . 2.0 
442.0 
346.3 
10.0 
530.4 
272.1 
8 
to 
19 
inches.. . . 1.0 
394.4 
164.9 
5.0 
462.4 
288.6 
20 
to 
31 
inches.... Trace 
285.6 
181.4 
2.0 
367.2 
222.6 
32 
to 
43 
inches.... None 
231.2 
296.9 
2.0 
346.8 
222.6 
44 
to 
55 
inches.... 0.5 
387.6 
272.1 
1.5 
367.2 
206.1 
Samples taken 
13 July, 
1912. 
Hole No. 1. 
Hole No. 4. 
Nitric 
Total 
Nitric 
Total 
Nitrogen 
Nitrogen" 
Chlorin 
Nitrogen 
Nitrogen 
Chlorin 
1 
to 
3 
inches.... 24.0 
680.0 
3,474.0 
222.7 
1,094.8 
3,051.0 
4 
to 
7 
inches... . 2.0 
455.6 
478.3 
20.0 
646.0 
494.8 
8 
to 
19 
inches... . 0.5 
258.4 
371.1 
30.0 
578.0 
907.1 
2 Oto 
31 
inches. . . . 24.0 
278.8 
395.8 
12.0 
469.2 
511.2 
32 
to 
43 
inches.... 5.0 
380.8 
494.8 
16.0 
340.0 
288.6 
44 
to 
55 
inches.... Trace 
350.0 
313.3 
20.0 
530.0 
395.8 
Hole No. 2. 
Hole No. 5. 
Nitric 
Total 
Nitric 
Total 
Nitrogen 
Nitrogen 
Chlorin 
Nitrogen 
Nitrogen 
Chlorin 
1 
to 
3 
inches. . . . 20.0 
625.6 
164.9 
340.1 
1,033.6 
1,937.8 
4 
to 
7 
inches.... 1.0 
625.6 
82.4 
34.5 
571.2 
453.5 
8 
to 
19 
inches.... 2.0 
455.6 
247.4 
79.2 
591.6 
618.3 
20 
to 
31 
inches.. . . 32.0 
408.0 
437.0 
36.3 
578.0 
453.5 
32 
to 
43 
inches. . . . 30.0 
380.8 
371.1 
83.7 
501.4 
395.8 
44 
to 
55 
inches.... Water 
.... 
.... 
71.5 
508.2 
445.3 
Hole No. 3. 
Hole No. 6. 
Nitric 
Total 
Nitric 
Total 
Nitrogen 
Nitrogen 
Chlorin 
Nitrogen 
Nitrogen 
Chlorin 
1 
to 
3 
inches.. . . 2.0 
571.2 
82.4 
24.0 
734.4 
329.8 
4 
to 
7 
inches.. . . Trace 
285.6 
41.2 
3.0 
516.8 
329.8 
8 
to 
19 
inches.... None 
326.4 
123.6 
2.0 
448.8 
247.4 
20 
to 
31 
inches.... Trace 
333.2 
181.4 
8.0 
360.4 
164.9 
32 
to 
43 
inches. . . . None 
190.4 
206.2 
5.0 
326.4 
164.9 
44 
to 
55 
inches.... None 
217.6 
329.8 
3.0 
401.2 
288.6 
56 
to 
67 
inches. 
.... 
• • • • 
1.5 
319.6 
329.8 
There were three samples of ground-water taken from this 
area, one on 12 December, 1911, and two 15 May, 1912. The 
sample taken 12 December, 1911, was taken from Hole No. 1. The 
sample of soil representing the top three inches of this section, 
carried 422.7 p. p. m. of nitric nitrogen, as is shown by the prev¬ 
ious statement of results, and the nitrates diminished very rapidly 
with depth. The other two samples were taken 15 May, 1912, one 
from Hole No. 4 and the other from Hole No. 6. One of these 
