Mar., 11925 
Toxicity Studies with Dicyanodiamide on Plants 
429 
Table VI .—Green weights of cowpeas from pots receiving various amounts of sodium 
nitrate with and without dicyanodiamide 
NORFOLK SANDY LOAN 
Source of nitrogen 
Fertilizer 
ratio 
NH3-P2O5-K2O 
No nitrogen.... 
Dicyanodiamide 40. 
Dicyanodiamide 40, sodium nitrate 5. 
Dicyanodiamide 40, sodium nitrate 10. 
Dicyanodiamide 40, sodium nitrate 20. 
Dicyanodiamide 40, sodium nitrate 40 
Dicyanodiamide 40, sodium nitrate 80. 
Sodium nitrate 5... 
Sodium nitrate 10._. 
Sodium nitrate 20. 
Sodium nitrate 40.. -... 
Sodium nitrate 80.. 
0-8-4 
4- 8-4 
4.5-8-4 
5- 8-4 
6- 8-4 
8-8-4 
12-8-4 
.5-8-4 
1- 8-4 
2- 8-4 
4-8-4 
8-8-4 
Green 
weight 
Average 
Variation 
from 
check 
Nodule 
formation 
Grams 
32.6 
35.5 
24.1 
15.7 
13.1 
14.5 
15.1 
15.9 
16.8 
21.1 
20.3 
16.6 
20.9 
25.8 
15.5 
19.2 
38.5 
31.5 
36.5 
38.9 
31.9 
33.7 
33.9 
35.5 
37.6 
38.9 
34.1 
19.9 
13.8 
15.5 
19.0 
20.9 
17.4 
35.0 
37.7 
32.8 
34.7 
38.3 
-14.2 
-20.3 
-18.6 
-15.1 
-13.2 
-16.7 
3.6 
-1.3 
.6 
4.2 
/Abundant. 
\ Do. 
/ Do. 
\Many. 
/ Do. 
\ Do. 
/ Do. 
\ Do. 
/Abundant. 
\Many. 
( Do. 
I Do. 
1 Do. 
I Do. 
/ Few. 
\Many. 
/ Do. 
\ Do. 
/ Do. 
\ Do. 
/ Do. 
\ Do. 
/Abundant . 
\ Do. 
{ Many. 
Do. 
CHESTER LOAM 
No nitrogen. 
Dicyanodiamide 40.. 
Dicyanodiamide 40, sodium nitrate 5. 
Dicyanodiamide 40, sodium nitrate 10 
Dicyanodiamide 40, sodium nitrate 20 
Dicyanodiamide 40, sodium nitrate 40. 
Dicyanodiamide 40, sodium nitrate 80. 
Sodium nitrate 5. 
Sodium nitrate 10. 
Sodium nitrate 20. 
Sodium nitrate 40. 
Sodium nitrate 80. 
0-8-4 • 
f 50.6 
V 52.4 
} 51.5 
4-8-4 * 
f 42.9 
\ 49.0 
1 46.0 
-5.5 
4.5-8-4 - 
f 51.8 
\ 48.8 
} 50.3 
-1.2 
5-8-4 • 
f 55.1 
\ 51.0 
| 53.1 
1.6 
6-8-4 ■ 
f 54.5 
\ 57.3 
| 55.9 
4.4 
f 53.7 
8-8-4 ■ 
I 56.1 
57.7 
• 55.3 
3.8 
l 53.8 
12-8-4 • 
f 56.0 
\ 46.9 
51.5 
.0 
.5-8-4 « 
f 52.0 
\ 52.3 
52.2 
.7 
1-8-4 - 
f 57.7 
\ 54.9 
■ 56.3 
4.8 
2-8-4 - 
f 60.8 
\ 53.8 
} 57.3 
5.8 
4-8-4 - 
f 58.6 
1 61.6 
} 60.1 
8.6 
8-8-4 . 
f 66.9 
\ 65.4 
} 66.2 
14.7 
