The Fixation oe Nitrogen in Colorado Soils 21 
Samples taken May 15, 1912. 
Nitric Nitrogen 
Total Nitrogen 
Chlorin 
1. 1 to 3 inches . 
190.0 
992.8 
1,797.7 
4 to 7 inches . 
20.0 
693.6 
634.9 
2. 1 to 3 inches . 
274.9 
992.8 
948.3 
4 to 7 inches . 
74.8 
666.4 
659.7 
3. 1 to 3 inches . 
253.1 
965.6 
329.8 
4 to 7 inches . 
20.0 
625.6 
602.0 
4. 1 to 3 inches . 
30.0 
741.2 
602.0 
4 to 7 inches . 
15.0 
625.6 
371.1 
5. 1 to 3 inches . 
5.0 
639.2 
140.2 
4 to 7 inches . 
5.0 
544.0 
329.8 
6 . 1 to 3 inches . 
3.0 
680.0 
338.1 
4 to 7 inches . 
1.5 
557.6 
359.8 
Alfalfa field .. 
80.0 
1,761.2 
18,554.0 
Brown surface soil . 
3,814.0 
5,412.8 
12,493.0 
12 feet from edge of “brown spot”. . , 
7.0 
557.6 
247.4 
“Brown spot” . 
8,702.0 
9,329.6 
14,060.8 
“Brown spot” . 
5,312.5 
6 , 120.0 
21,935.0 
Samples 
taken 
June 12, 1912. 
Nitric Nitrogen 
Total Nitrogen 
Chlorin 
1. 1 to 3 inches . 
253.6 
938.4 
2,597.5 
4 to 7 inches .. 
16.0 
673.2 
676.1 
2. 1 to 3 inches . 
289.3 
1,156.0 
8,106.0 
4 to 7 inches . 
194.5 
843.2 
890.6 
3. 1 to 3 inches .. 
324.2 
1,081.2 
2,185.3 
4 to 7 inches . 
16.0 
683.4 
593.7 
4. 1 to 3 inches . 
117.1 
'< ul .6 
808.1 
4 to 7 inches . 
12.0 
5,511.6 
222.7 
5. 1 to 3 inches . 
24.0 
632.4 
453.5 
4 to 7 inches . 
4.0 
516.8 
329.8 
* 6 . 1 to 3 inches . 
6.0 
686.8 
313.3 
4 to 7 inches . 
• 
8.0 
584.8 
907.1 
Nitric Nitrogen 
Total Nitrogen 
Chlorin 
Alfalfa field . 
20.0 
1,999.2 
19,024.0 
Brown surface soil . 
6,970.9 
7,684.2 
23,304.0 
Brown soil tree holes . 
1,228.7 
1,873.2 
4,813.0 
“Brown spot” . 
15,275.0 
17,272.0 
18,908.0 
“Brown spot” . 
5,231.5 
6,079.2 
19,131.0 
“Brown spot” . 
7,077.0 
• 8,500.0 
13,812.0 
Surface-soil 16 feet from edge of last sample 
16.0 
591.6 
273.9 
Samples 
taken 
13 July, 1912. 
Nitric Nitrogen 
Total Nitrogen 
Chlorin 
1. 1 to 3 inches . 
261.4 
952.0 
2,482.0 
4 to 7 inches . 
12.0 
754.8 
667.9 
2. 1 to 3 inches . 
351.9 
1,081.2 
1,896.5 
4 to 7 inches . 
57.2 
686.8 
658.2 
3. 1 to 3 inches . 
266.0 
897.7 
1,467.8 
4 to 7 inches . 
35.0 
625.6 
247.4 
4. 1 to 3 inches . 
107.8 
870.4 
676.2 
4 to 7 inches . 
42.2 
646.0 
272.1 
5. 1 to 3 inches . 
12.0 
652.8 
247.4 
4 to 7 inches . 
6.0 
646.0 
164.9 
6 . 1 to 3 inches . 
10.0 
693.6 
123.7 
4 to 7 inches . 
0.5 
476.0 
206.2 
Alfalfa field . 
25.0 
1,788.4 
18,743.0 
“Brown spot” . 
11,287.5 
13,804.0 
15,733.0 
“Brown spot” . 
4,356.5 
5,562.4 
17,993.0 
♦This section No. 6 had been irrigated quite recently. 
