22 
The Colorado Experiment Station 
The first set of samples taken for the purpose of determining 
the distribution of the nitrates in depth was taken 12 December, 
1911. While the results are somewhat erratic, I think that this is 
in a measure, if not altogether, due to the effects of late irrigation. 
I have, unfortunately, no means of obtaining data pertaining to this 
feature of the question. These holes, or sections, are arranged in 
pairs 1 and 4, 2 and 5, 3 and 6. This is done because 1 and 4 are 
similarly located and are about 50 or 60 feet apart, one being im¬ 
mediately north of the other; 2 and 5 constitute another pair; and 
3 and 6, another. This pair, 3 and 6, is located in the very outer 
edge of the bad territory of 1911, which was apparently quite good 
territory in 1912. The seventh section was taken in territory which 
has not, up to the present time, shown serious trouble, if it has shown 
any trouble at all. The chlorin was not determined in the first 
series. 
ANALYSES OF SAMPLES OF VERTICAL SECTION. 
Samples taken 12 December, 1911. 
Hole No. 1 Hole No. 4 
Nitric 
Total 
Nitric 
Total 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
1 
to 
3 
inches 
422.7 
1,128.3 
3.0 
992.8 
4 
to 
6 
inches 
85.5 
707.2 
8.5 
870.4 
7 
to 
18 
inches 
26.0 
516.8 
20.0 
501.4 
19 
to 
31 
inches 
5.0 
442.0 
28.0 
680.0 
31 
to 
42 
inches 
0.2 
442.0 
48.0 
469.2 
43 
to 
54 
inches 
0.1 
346.8 
50.0 
380.8 
Hole 
No. 2 
Hole No. 
5 
Nitric 
Total 
Nitric 
Total 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
1 
to 
3 
inches 
2.8 
639.2 
18.1 
639.2 
4 
to 
6 
inches 
6.0 
605.2 
18.5 
530.4 
7 
to 
18 
inches 
2.4 
578.0 
13.0 
578.0 
19 
to 
30 
inches 
24.0 
455.6 
28.0 
487.8 
31 
to 
42 
inches 
52.0 
448.8 
56.0 
639.2 
43 
to 
54 
inches 
80.0 
537.2 
32.0 
516.8 
Hole No. 3 
Hole No. 6 
Hole No. 7 
Nitric 
Total 
Nitric Total 
Nitric 
Total 
1 
Nitrogen Nitrogen 
Nitrogen Nitrogen Nitrogen 
Nitrogen 
1 
to 
3 inches 
. 0.8 
652.8 
24.6 904.4 
1.2 
829.6 
4 
to 
6 
inches . 
. 2.4 
516.8 
12.2 564.4 
0.5 
639.2 
7 
to 
18 
inches 
. 1.6 
374.0 
9.6 564.4 
0.6 
401.2 
19 
to 
30 
inches 
. 1.2 
272.0 
2.4 394.4 
1.0 
306.2 
31 
to 
42 
inches 
. 1.2 
244.8 
2.4 435.2 
1.2 
326.4 
43 
to 
54 
inches 
. 0.8 
285.6 
2.0 503.2 
0.7 
306.0 
Samples taken 15 May, 1912. 
Hole No. 
1 . 
Hole 
No. 4. 
Water- Nitric 
Total 
Water- Nitric Total 
Soluble Nitrogen 
Nitrogen 
Chlorin Soluble Nitrogen Nitrogen Chlorin 
1 
to 
3 
inches.. 
.13,475.0 237.4 
918.0 
3,158.4 3,925.0 
52.9 1,020.0 
387.6 
4 
to 
7 
inches.. 
. 5,425.0 15.0 
664.4 
940.0 4,326.0 
3.5 700.0 
197.9 
8 
to 
19 
inches.. 
. 9,000.0 6.0 
530.4 
560.7 3,215.0 
12.0 556.7 
577.2 
20 
to 
31 
inches.. 
. 6,550.0 10.0 
489.6 
470.0 7,375.0 
32.0 605.2 
593.7 
32 
to 
43 
inches.. 
.10,625.0 6.0 
448.8 
494.8 8,600.0 
57.0 503.2 
634.9 
44 
to 
55 
inches.. 
.17,925.0 6.0 
462.4 
354.6 . 
