Feb. 26, iQi7 Effect of Water and Manure on Nitrates in Soils 
349 
with the amount of water applied, the difference being 7.1 p. p. m. with 
no, water and 1.0 p. p. m. with the 40-inch irrigation. In the upper feet 
the greater accumulation of nitrates under the larger manuring is more 
clearly evident than in the lower feet, although *in almost every foot 
the difference is in favor of the 15-ton application. 
Table IV .—Total nitrates in the fall at various depths in cropped and fallow soil receiving 
different quantities of manure and irrigation water. Average for three years 
[Results expressed as p. p. m. of sodium nitrate] 
cropped son, 
Total nitrates. 
Depth of soil 
No water. 
5 inches of 
water. 
10 inches of 
water. 
20 inches of 
water. 
30 inches of 
water. 
40 inches of 
water. 
Av- 
er- 
Manure applied 
age. 
(tons). 
0 
S 
IS 
0 
5 
IS 
0 
S 
IS 
0 
5 
IS 
0 
5 
IS 
0 
5 
IS 
Feet. 
1. 
18.8 
12. 7 
30.9 
19*4 
12.1 
20. 0 
17.0 
13*3 
26.1 
12.1 
14 -S 
17.6 
ii -5 
16.4 
23.6 
9.1 
10.3 
12.7 
16.6 
2. 
17.6 
8-5 
23.6 
13-9 
7-9 
12.1 
iS-2 
10.3 
14*5 
12 .1 
6.1 
10.3 
8- S 
7-9 
13-3 
10.9 
3-6 
12. 7 
11.6 
3 . 
14-5 
7-9 
IS- 2 
9 *i 
7-3 
20.6 
9-7 
12. 7 
IS-8 
7-3 
6.7 
9 -i 
7-9 
6.1 
8-5 
4.2 
3-6 
S -5 
9-5 
4 . 
21.8 
7-3 
20.6 
13-9 
7-9 
17.0 
12.1 
14*5 
18.8 
9.1 
6.7 
10.3 
10.9 
4.2 
7-9 
4-8 
4 * 8 
3 -o 
10.9 
s. 
19.4 
9-7 
22.4 
13-3 
10.3 
9 -i 
8-5 
7*9 
13*3 
7-9 
4-2 
ii- S 
7-9 
3*6 
5*5 
4.8 
4-8 
12.1 
9.8 
6. 
18.2 
IS- 8 
13-3 
12.1 
9-7 
9-7 
8- S 
6.7 
11* 5 
9.1 
3-6 
ii-S 
10.9 
4.2 
6.1 
6.7 
11 . s 
2-4 
9-5 
7 . 
IS-2 
10.3 
13-3 
12.7 
S -5 
15-7 
9 *i 
10.3 
10.3 
12.1 
6.1 
10.1 
13-3 
S -5 
10.9 
7*3 
9.1 
12. I 
10. s 
8. 
17. 6 
12.1 
12.1 
10.3 
12.1 
16.4 
9*7 
10.9 
10.3 
10.9 
7*9 
9-7 
12.7 
5*5 
12.7 
7-9 
9.1 
2.4 
10.6 
9 . 
ii -5 
8-5 
IS-2 
14-5 
10.9 
10.3 
8* S 
12.1 
ii -5 
8.5 
6.7 
9.1 
ii -5 
6.1 
10.9 
6.1 
6.7 
IO.3 
9*9 
10. 
6.7 
12.1 
9.1 
9 -i 
9-7 
14 -S 
13-9 
12.7 
IS* 2 
10.1 
6.7 
9-1 
6.7 
7-9 
ii -5 
4-8 
6.1 
6.7 
9.6 
Average. 
16.1 
10.5 
17.6 
12.8 
9-3 
14-5 
11.2 
11 .1 
14.7 
9-9 
6.9 
10.8 
10.2 
6.7 
11.1 
6-7 
7*0 
8.0 
10.8 
FALLOW SOIL 
1. 
46.7 
32.7 
89.1(43.6 
40.0 
107.3 
23.6 
76-4 
44.2 
23.6 
35-8 
30.3 
!< 5.8 
34.5 43.6 
13-3 
27.9 
26.1 
41.9 
2.. 
28.5 
27 -3 
76.3 
3 i *5 
27-3 
96.4 
19.4 
64.8 
34-5 
17.6 
36.4 
33*9 
13-9 
37* 632.7 
12. 7 
18.8 
25 - S 
35-3 
3 . 
36-4 
32-1 
SI* 5 
30-9 
35-8 
59-5 
16.4 
58.2 
36-4 
IS-8 
35-2 
24.8 
17.0 
42.433.9 
20.0 
19.4 
23.6 
32-7 
4 . 
46.1 
29.7 
47-3 
39*4 
22.4 
61. 2 
22.4 
64. 2 
33-9 
23.0 
36.4 
35*8 
IS-2 
35-8 
25 -S 
ii -5 
18.8 
20.6 
32.7 
5 . 
40.6 
32*7 
63.6 
33-9 
33-3 
44.8 
27.9 
41.8 
29.1 
31 - S 
41.8 
43-6 
14 -S 
23.0 
23.6 
12.1 
24. 2 
11.0 
31*8 
6. .. 
39 - 4 
29.1 
66.6 
37-6 
30-9 
7 i -5 
32.1 
49-7 
32.7 
30.3 
43 -o 
41.2 
14. 6 
38. 2 
34-5 
IS-8 
24. 2 
18. 2 
36.1 
7 . 
: 26. 7 
32-7 
81.8 
28. s 
29 - 7 
55-8 
28.5 
38.8 
29.7 
19.4 
39-4 
38 - 2 
14-5 
38.8 
37-0 
16. 4 
20.0 
17 *'- 
33 -o 
8. 
I 2 9 - 7 
23-0 
62.4 
24. 2 
23.0 
52-7 
24. 2 
31*5 
27-3 
24.8 
24. 2 
34 -o 
11. 5 
27-3 
3i-o 
14. 6 
28. 5 
24. 2 
28.8 
9 . 
23. 6 
18.2 
44-8 
. 13-9 
32.7 
40.0 
23.0 
24. 2 
24. 2 
24. 2 
21. 2 
37-0 
12.1 
26. 7 
35-8 
12. 7 
20.6 
25*5 
25-6 
10... 
20-6 
27-3 
64. 2 
20.0 
38.2 
61.8 
23.6 
34-5 
27.9 
23.0 
24. 2 
32-7 
16.4 
27.9 
31-5 
14.0 
17.6 
21. 2 
29-3 
Average. 
33*8 
28. s 
64.8j30.4 
31-3 
65.1 
24.1 
48.4 
32.0 
23-3 
33-8 
1 - 
14. 6 
33-2 
32-9 
14-3 
22.0 
21.4 
32-7 
The tendency for the nitrates to vary inversely with the irrigation 
water applied is noticed in figure 11 to be more pronounced for no manure 
and 15-ton applications than for 5-ton applications, but all show a little 
inclination in this direction. The effect of the irrigation is also seen 
at almost every foot in depth. As an average, the first two and the middle 
feet of the unirrigated plots are proportionately higher in nitrates than 
the other feet when compared with other moisture treatments. The 
tenth foot of the unirrigated soil is low, in some cases being lower than 
the plots with water applied. Of the irrigated plots, the top 4 feet 
of those plots receiving 10 inches and the top foot of those receiving 30 
inches of water are high. 
