May 14,1917 
Soil Nitrogen and Nutrition of Citrus Plants 
195 
Table VII .—Percentage of nitrogen added to soils in dried blood and green manures 
recovered as ammonia and nitrates after six weeks* incubation; also percentage gain or 
loss of nitrogen added. August 28, IQ14 
[Results expressed as milligrams of nitrogen per 100 gm. of soil] 
PLOT u 
Material added. 
Nitrogen 
in 
material 
added. 
Nitrogen 
as am¬ 
monia 
recov¬ 
ered in 
6 weeks. 
Percent¬ 
age of 
nitrogen 
as am¬ 
monia 
recov¬ 
ered. 
Nitrogen 
as ni¬ 
trate re¬ 
covered 
in 6 
weeks. 
Percent¬ 
age of 
nitrogen 
as ni¬ 
trate re¬ 
covered. 
Nitrogen 
remain- 
ingin 
soil after 
6 weeks. 
Gain or 
loss in 
nitrogen 
Percent¬ 
age of 
nitrogen 
gained 
or lost. 
Dried blood (1 per 
cent). 
137* 20 
6.44 
4.69 
70.56 
51-43 
1x9.00 
—18. 20 
—13- 27 
Vetch *2 (per cent).... 
65.20 
1.68 
2.58 
26.32 
40.37 
77 -oo 
11.80 
18.10 
Melilotus (2 per cent) 
48.40 
1.40 
2.89 
34.16 
70.58 
86.60 
38. 20 
78.93 
Soybeans (2 per cent). 
43-40 
— .14 
• 32 
12.04 
27. 74 
49-00 
5- 60 
1. 29 
Corn (2 per cent). 
30.02 
.00 
. 00 
18. 20 
60.61 
69.30 
39- 26 
130.20 
Cowpeas (2 per cent).. 
Black-eyed peas (2 
45-00 
.00 
.00 
22.04 
48.98 
63. 70 
18.70 
41.56 
per cent). 
42*40 
.98 
2.31 
18.96 
44-72 
72.10 
19.70 
70.05 
Oats (2 per cent). 
20. 20 
- ,28 
— 1-39 
—1.68 
—8.32 
21. 70 
x. 50 
7-43 
PLOT H 
Dried blood (1 per 
cent) . 
Vetch (2 per cent).. . 
Melilotus (2 per cent). 
Soybeans (2 per cent). 
Corn (2 per cent). 
Cowpeas (2 per cent). 
Black-eyed peas (2 
per cent). 
Oats (2 per cent). 
137-20 
65. 20 
48.40 
43-40 
30. 02 
45 -oo 
42.40 
20. 20 
32.48 
8. 12 
.70 
.OO 
.OO 
• OO 
•56 
• OO 
23.67 
12.45 
x -45 
.00 
. 00 
. 00 
I- 33 
.00 
0.00 
XI. 48 
13 - 73 
xo. 64 
14- 84 
12. 32 
12.88 
—2. l6 
0.00 
17.61 
28.35 
24 - 53 
49 - 43 
27- 38 
30.38 
— 10. 69 
57 - 40 
. 64.40 
79-80 
44. 80 
75.60 
58. 80 
63.00 
19. 60 
—79- 80 
- .80 
31. 40 
x. 40 
45 - 58 
13. 80 
2a 60 
“ .60 
—58.16 
“i. 23 
64.88 
3-23 
151-90 
30.66 
48. 58 
—2.97 
PLOT B 
Dried blood (1 per 
per cent).., . 
137 - 20 
47-74 
34 - 79 
0.00 
0.00 
63.00 
—74- 20 
- 54-08 
Vetch (2 per cent).... 
65. 20 
13 - 58 
20. 83 
14.43 
22 . IX 
71.40 
6. 20 
9 - 5 i 
Melilotus (2 per cent) . 
48. 40 
I. 70 
3-51 
15.60 
32.23 
74. 90 
26. 50 
54 - 75 
Soybeans (2 per cent) . 
43 - 40 
. 26 
. 60 
II. 34 
26.13 
46. 20 
2. 80 
6- 45 
Corn (2 per cent). 
30. 02 
1 . 18 
3-93 
17.00 
56.63 
72.10 
42.08 
140.17 
Cowpeas (2 per cent). 
45-00 
.70 
I. 56 
12. 48 
* 7 - 73 
51-80 
' 6.80 
15. xx 
Black-eyed peas (2 
per cent). 
42 . 40 
I.26 
2. 96 
15* 54 
36-65 
50.40 
8.00 
18.87 
Oats (2 per cent). 
20. 20 
. 26 
I. 29 
-.84 
—4* 16 
16. 80 
“ 3-40 
—i6- 83 
PLOT P 
Dried blood (1 per 
cent...). 
Vetch (2 per cent).... 
Melilotus (2 per cent). 
Soybeans (2 per cent). 
Corn (2 per cent). 
Cowpeas (2 per cent). 
Black-eyed peas (2 
per cent). 
Oats (2 per cent). 
137- 30 
27-16 
19-79 
50.68 
36.94 
X12. 00 
—25. 20 
— 18.37 
65. 20 
10-39 
.60 
19.32 
. 29.63 
74. 20 
9. 00 
13.80 
48.40 
•74 
I- 53 
40.88 
84.46 
99.40 
51-00 
105. 37 
43- 40 
.28 
.65 
13-44 
30.97 
51.80 
8.40 
19.36 
30.02 
.70 
2- 33 
18. 72 
62.36 
70. 70 
40.68 
135- 51 
45-00 
.28 
. 62 
22. 68 
50.40 
65.80 
20.80 
46. 22 
42.40 
1.68 
3-96 
19.84 
46. 79 
76.30 
33- 90 
79-95 
20. 20 
— .14 
“ .69 
—1.40 
— 7.23 
22. 50 
2.30 
. ii- 39 
VIRGIN soil 
Dried blood (1 per 
cent). 
Vetch (2 per cent).... 
Melilotus ( 2 per cent). 
Soybeans (2 per cent). 
Corn (2 per cent). 
Cowpeas (2 per cent). 
Blade-eyed peas (2 
per cent). 
Oats (2 per cent). 
137 - 20 
41. 28 
30.09 
“ O.56 
— 0.41 
70.00 
“67. 20 
48- 48 
65. 20 
7. 20 
xi. 04 
- .84 
— 1. 29 
65.00 
— . 20 
- .31 
48. 40 
XX. 60 
23.97 
13 - l6 
27 -19 
74- 20 
25.80 
53 - 3 i 
43-40 
.40 
.92 
7-12 
16.41 
45- 20 
I.80 
4-15 
30. 02 
•34 
I -13 
X4* 84 
49.43 
67. 20 
37 -18 
123. 85 
45-oo 
•54 
X. 20 
10.08 
24.00 
63. 20 
18. 20 
40.44 
42. 40 
3- 20 
7-55 
12.88 
30.38 
57 - 40 
15-00 
35 - 38 
20. 20 
— . 72 
“ 3-56 
— 1. 26 
— 6. 24 
19.16 
— x. 04 
- 5*15 
