194 
Journal of Agricultural Research 
Vol. IX, No. 7 
percentage recovered from red clover or alfalfa. Small nitrogen gains 
were secured from buckwheat in soils U and F, but in soils B and H 
there was considerable nitrogen lost and a small loss in the virgin soil. 
On August 28 a third set of samples was taken from the experimental 
plots at Riverside and one sample from the adjacent virgin soil. Each 
sample was divided into nine portions. One portion of each soil was 
conducted as a control. The other portions received, respectively, 1 per 
cent of dried blood, 2 per cent of vetch, melilotus, soybeans, corn, cow- 
peas, black-eyed peas, or oats. The results obtained in this experiment 
are presented in Tables VI and VII. 
Table VI. —Nitrification of dried blood and green manures in Citrus Experiment Station 
soils , Riverside , Cal. August 28, IQ14 
[Results expressed as milligrams of nitrogen per ioo gm. of soil] 
Plot U. 
Plot H. 
Plot B. 
Material added. 
Constitu¬ 
ent. 
Incubation period. 
Incubation period. 
Incubation period. 
days. 
28 
days. 
A 2 
days. 
a * 4 
days. 
28 
days. 
A 42 
days. 
a 14 
days. 
28 
days. 
days. 
Dried blood (1 per cent)... 
Ammonia. 
4 * 34 
6. 7a 
6.44 
34-44 
43-40 
38.48 
35 - 5 <S 
45-98 
47 - 74 
Do. 
Nitrates... 
42. 28 
66.36 
70.56 
•56 
•34 
. 00 
.28 
3-98 
— . 48 
Vetch (2 per cent).. 
Ammonia. 
4 - 34 
1.68 
r. 68 
10.92 
9 - 58 
8.12 
8.68 
17.9a 
X 3-58 
Do. 
Nitrates... 
17. 08 
24.92 
26.32 
5- 60 
12.10 
XI. 48 
• 5 <S 
6.02 
14- 48 
Melilotus (2 per cent). 
Ammonia. 
1.82. 
x. 96 
1.40 
8.96 
4*76 
. 70' 
9.80 
4 * 76 
I. 70 
Do. 
Nitrates... 
14- 84 
30.24 
34.16 
S- 04 
12. 99 
13.72 
2.80 
IS- 18 
IS- 60 
Soybeans (2 per cent).:... 
Ammonia. 
.14 
. 00 
— * 14 
. 00 
. 00 
.00 
. 00 
1.68 
.26 
Do.. 
Nitrates... 
a. 12 
7.28 
12.04 
2.80 
9. 02 
XO.64 
x. 68 
7.84 
II. 34 
Corn (2 percent). 
Ammonia. 
.14 
. 00 
. 00 
.00 
. 28 
.00 
.28 
.84 
1. 18 
Do. 
Nitrates... 
.28 
9 * »4 
18. 20 
.28 
4-54 
14.84 
.84 
1.96 
17.00 
Cowpeas (2 per cent). 
Ammonia. 
• 30 
.28 
• .00 
-. 14 
. 00 
.00 
.14 
1.40 
• 70 
Do . 
Nitrates.. . 
—. 70 
X. 12 
22.04 
56 
10. 98 
12.32 
. 00 
6. 72 
12. 48 
Black-eyed peas (a per 
cent). 
Ammonia. 
4-34 
1.68 
.98 
2.80 
x. 68 
• 56 
5.60 
1.68 
x. 26 
Do . 
Nitrates... 
—. 56 
io- 36 
18.96 
—. 56 
IS* 18 
12. 88 
. 14 
2.08 
IS- 54 
Oats (2 per cent) . 
Ammonia. 
.00 
. 00 
- .28 
.00 
.28 
. 00 
—. 42 
. 28 
. 26 
Do. 
Nitrates... 
-.69 
—1.40 
-1.68 
—• 56 
• 34 
—2.16 
. 28 
-.84 
-.84 
Water only. 
Ammonia. 
.98 
1.40 
1.40 
X. X2 
1.40 
X. 12 
.84 
1.12 
.98 
Do. 
Nitrates... 
X. 12 
1.96 
2. 26 
I. 12 
1.90 
2. 80 
.56 
x. 40 
1. 26 
Materia! added. 
Constituent. 
Plot F. 
Virgin soil. 
Incubation period. 
Incubation period. 
Dried blood (i per cent) 
Do. 
Vetch (2 per cent). 
Do... 
Melilotus (2 per cent)... 
Do. 
Soybeans (2 per cent)... 
Do. 
Corn (2 percent). 
Cowpeas (2 per cent). 
Do. 
Black-eyed peas (2 per cent)., 
Do. 
Oats (2 per cent). 
Do... 
Water only.... 
Do. 
14 days. 
28 days. 
42 days. 
14 days. 
28 days. 
42 days. 
Ammonia. .. 
24.64 
28.14 
27.16 
36.42 
51*44 
41.28 
Nitrates . 
ii. 64 
44 - «4 
50.68 
— - 14 
- .28 
— . 56 
Ammonia.. 
5- 88 
. • 72 
•39 
•30 
14 - 98 
7. 20 
Nitrates. 
8.56 
15*40 
19.32 
* 14 
— * 14 
- .84 
Ammonia... 
•44 
i- 54 
• 74 
10. 50 
17. 78 
xx. 60 
Nitrates. 
14- 12 
38.30 
40. 88 
. 00 
3-64 
13-16 
Ammonia. . 
— . 16 
•32 
.28 
.00 
.14 
.40 
Nitrates . 
a- 34 
9. 80 
13-44 
.00 
3.12 
7. ia 
Ammonia. .. 
- .14 
• 70 
.70 
3*22 
1. 26 
•34 
Nitrates .. 
. 02 
10.92 
18. 72 
• OO 
8.68 
14.84 
Ammonia. .. 
- .28 
. 22 
.28 
.28 
x.82 
• 54 
Nitrates . 
— .40 
6.16 
22.68 
— • 14 
.84 
10. 08 
Ammonia... 
4*52 
i* 54 
1. 68 
5* IS 
10. 50 
3- 20 
Nitrates. 
— . 12 
13 - 72 
19-84 
— .14 
3*92 
12.88 
Ammonia... 
- .28 
.14 
- .14 
— . 14 
. 14 
— *73 
Nitrates. 
— .40 
- .84 
— 1.40 
— .28 
— . 56 
— 1. 26 
Ammonia ... 
1.12 
x. 26 
1.12 
.98 
1. 82 
x. 28 
Nitrates. 
.96 
1. 68 
1.96 
* 70 
x. 12 
1.68 
