210 
Journal of Agricultural Research 
Vol. IX, No. 7 
The effect of rainfall in causing a downward movement of nitric 
nitrogen is seen to have taken place in the unfertilized plots as well as 
in the fertilized. 
In Tables XI to XIII it was seen that the effect of the application of 
nitrogenous materials to the soils invariably increased the nitrate con¬ 
tent of the soil, especially the surface layers; and it was also seen that 
the nitrates were very completely leached out of the surface layers by 
the winter rains, producing a rather marked seasonal variation in the 
nitrate content of the heavily fertilized soils. 
Table XIV .—Seasonal 'variation in ammonia in furrow-irrigated soils receiving heavy 
applications of nitrogenous fertilizers. September, 1914, to August, igij) inclusive 
[Results expressed as milligrams of nitrogen per 100 gm. of soil] 
Period. 
Plot A. 
Plot C. 
Plot F. 
Depth.inches.. 
0-6 
6-18 
18-30 
0-6 
6-18 
18-30 
0-6 
6-18 
18-30 
*914- 
September. 
0. 74 
* 74 
.81 
0- 74 
• 74 
.18 
0.46 
.46 
. 11 
I* 02 
0* 74 
* C7 
0.46 
• 12 
O. 
O.46 
« C7 
a 46 
.46 
October. 
.98 
• 95 
.87 
.98 
.66 
.78 
November. 
.18 
* CO 
• IC 
4 5/ 
December. 
• 74 
•39 
.18 
. 2C 
* 2ft 
•3® 
, ^ 
1915- 
January. 
. 60 
.46 
• 12 
• AjI 
• 71 
.46 
* 11 
. 10 
.60 
.67 
.60 
. 2ft 
February. 
•32 
. 60 
* *K> 
. l8 
• /* 
.46 
.81 
• 3 / 
* 2C 
* 3y 
* 11 
* 11 
March. 
•43 i 
• 16 
.29 
* II 
• 53 
. 22 
* 22 
* 20 
.29 
' -rs 
.08 
.18 
April.. 
.64 
* 
.46 
.67 
Dost. 
• 36 
• oy 
.TP 
•36 
June... 
* 22 
* II 
• 
* II 
Lost. 
. QA 
• 4 3 
.46 
. 60 
.36 
July. 
.46 
.29 
*25 
* 
•IS 
* II 
* 20 
• 2 5 
* * * 
August. 
Plot G. 
Plot H. 
Plot L. 
1914. 
September. 
t. 02 
p. 46 
* .46 
•43 
* CO 
* 
0.32 
.46 
.18 
.18 
o-74 
x. 02 
0.46 
• 74 
• 39 
i , 20 
0.46 
.46 
.18 
• 12 
1.02 
1.02 
1.09 
* OO 
n. '7/1 
0.46 
.46 
•15 
.29 
October.. 
1.02 
/4 
November. 
December. 
.88 
• 74 
.88 
* 74 
•43 
* i 4 
i * 5y 
* yy 
• 39 
1915- 
•57 
•39 
. 88 
* 12 
« 22 
.60 
. A 2 
.81 
.46 
.60 
.64 
.60 
•25 
.08 
•53 
.18 
.04 
•25 
February. 
- 2C 
.08 
• 2C 
• 45 
* *4 
.08 
- 3C 
March. 
* 
• OO 
.46 
• ^5 
- ff7 
April.. 
•50 
. 60 
- • i>y 
.18 
♦ 20 
* l8 
• oy 
. 22 
* 20 
* 22 
• 53 
.36 
June... 
. II 
• IC 
• OO 
♦ 60 
• CO 
. II 
. IC 
July.... 
•57 
• 50 
.18 
. xr 
• *y 
* 20 
• 53 
• 2 5 
. 26 
. TC 
August. 
* 1 j 
.08 
* ov 
• 12 
• z y 
.08 
*OI 
• 74 
• O* 
* 43 
• A 5 
Plot O. 
Plot Q . 
Plots. 
1914- 
September. 
1.02 
0. 74 
• 74 
•25 
* «!<. 
0.60 
1.30 
1.02 
0.46 
.78 
• 39 
.46 
O* 12 
I* 20 
0.46 
.46 
•3® 
•IS 
October.. 
1.02 
.46 
.18 
* 46 
•57 
.18 
■ 2C 
T. TJ. 
• 22 
November. 
December. 
• 74 
• 75 
1.14 
1.20 
A* A 4 
x. S 8 
02 
• 3-* 
.46 
• C2 
1915- 
January. 
I. 20 
, • 5° 
.46 
.08 
1.02 
• Cl 
.46 
s 2C 
1/^0 
.46 
- 2ft 
February. 
.46 
•71 
•53 
.67 
.67 
• 7 1 
• oy 
.60 
T- OO 
• oy 
.08 
. 5 2 
March . 
• O’* 
.46 
• 39 
a 22 
• DO 
• 95 
• CO 
• 36 
• Cl 
* w 4 
. 18 
* 3y 
.46 
April . 
•36 
.78 
1.06 
T_ 9ft 
June . 
• oy 
, 2C 
.18 
. 20 
• 3 X 
• A 1 
■ 43 
•36 
. 2ft 
• 39 
.18 
, Ttf 
July . 
• *0 
• 39 
• 22 
• /4 
4 8l 
• 45 
• 2 C 
_ 51 ? 
August . . . 
• 04 
•85 
.18 
* *-j 
4 II 
a- 3 W 
I- 13 
• oy 
.36 
• A 5 
. 0 c 
• *5 
