214 
Journal of Agricultural Research 
Vol. IX, No. 7 
from the furrows immediately before and as soon after the October 
irrigation as the moisture condition would permit. The results secured 
in the experiment are shown in Table XX. 
Table XIX .—Vertical distribution of nitric nitrogen before and after the June irrigation 
of 1915 
[Results expressed as milligrams of nitrogen per 100 gm. of soill 
Depth, in inches. 
Sampled be- 
fore or after 
irrigation. 
Plot. 
Aver¬ 
age of 
all 
plots. 
A. 
C. 
T. 
G. 
H. 
I*. 
O. 
Q. 
s. 
U. 
o-6 . 
/Before. 
1.99 
1.70 
1.10 
3*52 
4.21 
2.32 
1.41 
2.73 
2.00 
2.21 
2.399 
[After. 
1*39 
1.16 
1.01 
2. 74 
2.25 
1.58 
.90 
1.62 
1.97 
1.97 
1.659 
6-18. 
/Before. 
•57 
•35 
. 22 
.86 
•78 
•57 
•36 
.85 
1.09 
1-34 
.699 
[ After. 
.22 
•25 
.13 
.60 
.29 
.38 
•30 
.67 
•53 
•77 
.414 
18-30. 
/Before. 
. 20 
.22 
.18 
•50 
.64 
.64 
•27 
• 79 
•78 
•49 
• 471 
\ After. 
•15 
.08 
.06 
•42 
.18 
.29 
.18 
.62 
•39 
•35 
. 272 
30-43 . 
/Before. 
.29 
•15 
.08 
•59 
•97 
•SO 
•50 
.81 
•95 
•36 
.520 
[After. 
•30 
.21 
.14 
.46 
.80 
• 49 
•49 
•50 
.62 
.40 
.441 
42-54 . 
/Before. 
•15 
•15 
.08 
•78 
•97 
•37 
.42 
• 71 
1.02 
•23 
.488 
[After. 
. 21 
.18 
.14 
.69 
.68 
•35 
•35 
.67 
.70 
•23 
.420 
54-66 . 
/Before. 
. 11 
.22 
• 25 
.46 
•94 
.64 
.29 
1-34 
.85 
. 20 
• 530 
[ After. 
. 16 
.18 
• 30 
•49 
.82 
.66 
•35 
1.40 
.84 
.27 
•537 
66-78. 
/Before. 
•15 
.20 
.11 
.64 
• 7 i 
.98 
•49 
1-34 
I -13 
•15 
•590 
1 After. 
.24 
.18 
. 16 
•53 
.86 
1.14 
•49 
1.08 
.90 
. 21 
•579 
78-90.... 
/Before.. 
. 20 
•25 
. 20 
•53 
•78 
.60 
.29 
.93 
60 
•13 
•450 
1 After. 
.18 
•27 
.14 
•72 
•57 
.64 
■45 
.81 
•63 
•15 
.456 
90-102. 
/Before. 
•25 
.18 
.20 
•42 
•72 
.29 
•32 
•78 
•59 
•15 
•390 
[ After... 
/Before. 
.28 
1.17 
.69 
.28 
. 22 
. 20 
.18 
•38 
.18 
.69 
•53 
•49 
•50 
.29 
•39 
.29 
•74 
•99 
.67 
.46 
.42 
.42 
•15 
• 16 
•397 
.414 
.364 
102-114. 
[After... 
•29 
.18 
•35 
. 16 
Tabus XX .—Distribution of nitrates before and after the October irrigation of igi$ 
[Results expressed as milligrams of nitrogen per 100 gm. of soil] 
Depth in inches. 
Sampled be¬ 
fore or after 
irrigation. 
Plot A. 
Plot C. 
Plot F. 
Plot G. 
9 
inches 
from 
furrow. 
18 
inches 
from 
furrow. 
inches 
from 
furrow. 
18 
inches 
from 
furrow. 
. 9 
mches 
from 
furrow. 
18 
inches 
from 
furrow. 
inches 
from 
.furrow. 
18 
inches 
from 
furrow. 
/Before. 
1.66 
1.34 
3*28 
3 - *3 
*•37 
*•55 
2.89 
2.74 
[After. 
•53 
3-40 
• 7 * 
*3* 60 
.46 
3.12 
2.21 
8.08 
6-18 
/Before. 
•30 
•15 
.40 
•53 
.16 
•50 
.46 
*•23 
[After.... 
.06 
•39 
•*3 
*•44 
•15 
•65 
• *5 
2.63 
/Before. 
.06 
•33 
•*5 
.19 
.08 
.38 
• 03 
•57 
[After. 
.29 
•44 
. 16 
x. xo 
.18 
.60 
*03 
I- *3 
/Before.. 
. 11 
•25 
•15 
•*5 
.09 
• 23 
.08 
• 57 
30 “ 4 «... 
[After. 
. .22 
.46 
.08 
•59 
. 11 
.69 
. 11 
1. 82 
Plot H. 
Plot L. 
Plot O. 
Plot Q. 
0*6. 
/Before. 
5 * 19 
5-33 
a. 70 
3-72 
x. 18 
*79 
1.58 
3-51 
[After. 
.81 
x8. 41 
1.09 
24.44 
•53 
a. 20. 
1.40 
6. 78 
6—t8 
/Before.,. 
•57 
*•39 
•25 
.92 
. 20 
•36 
.22 
1-55 
[After. 
•38 
X.46 
•13 
.81 
.18 
1.43 
•32 
1.66 
tS-jd 
/Before. 
1-30 
I.92 
. 16 
x. 29 
•25 
. 11 
•67 
1.18 
[After. 
1.09 
2.56 
•07 
2.42 
.27 
•85 
•74 
3*54 
/Before. 
1.24 
*•31 
.18 
•39 
•23 
. 22 
•55 
. 20 
30—42 . »•»••••••• 
[After. 
•95 
3 - 5 * 
•36 
3-40 
.27 
•53 
•99 
•93 
Tn the surface 6 inches the nitrates 9 inches from the furrows are higher 
in all of the eight soils before irrigation, the reverse being true of the 
samples taken 18 inches from the furrows. As the results are consistent 
