Apr. 5, 1924 
Studies with Cyanamid 
55 
was included. The results, which were obtained by the reduction method, 
are given in Table IX and figure 7. 
Fig. 7.—Diagram showing the nitrates present in soils receiving dicyanodiamid, guanylurea sulphate, 
and ammonium sulphate 
Table VIII .—Nitrate formation from cyanamid in soils containing various per¬ 
centages of phenol 
Fertilizer 
Phenol' 
Nitrates 
mgm. N 
Recovery 
of N as 
nitrates 
mgm. N 
Nitrates 
mgm. N 
Recovery 
of N as 
nitrates 
mgm. N 
14 days 
36 days 
Per cent 
Control 
0 
3.13 
7.81 
Urea 
0 
5.00 
1.87 
14.88 
7.07 
Cvanamid.. 
0 
.81 
-2.32 
6.79 
-1.02 
Do 
0.01 
1.00 
-2.13 
6. 38 
-1.43 
Do 
.04 
.40 
-2.73 
3.97 
-3.84 
Do 
. 10 
.27 
-2.86 
.32 
-7.49 
Do 
.20 
.50 
-2.63 
.25 
-7.56 
Do 
.40 
.69 
-2.44 
.27 
-7.54 
Do 
1.00 
.30 
-2.83 
.50 
-7.31 
Do____ 
2.00 
.45 
-2.68 
.74 
-7.07 
56 days 
77 days 
Control...... 
0 
8.45 
10. 78 
Urea..... 
0 
18.38 
9.93 
18.94 
8.16 
Cyanamid..... 
0 
12.50 
4.05 
16.45 
5. 67 
Do..... 
.01 
12.02 
3. 57 
16.45 
5. 67 
Do..... 
.04 
9. 62 
1.17 
14. 53 
3. 75 
Do...... 
.10 
1.18 
-7. 27 
3.83 
-6.95 
Do..... 
.20 
.21 
-8.24 
.25 
-10.53 
Do....... 
.40 
.34 
-8.11 
.28 
-10. 50 
Do..... 
1.00 
.58 
-7.87 
.56 
-10.22 
Do...... 
2.00 
.78 
-7.67 
.50 
-10. 28 
° Cyanamid and urea were used at the rate of 10 mgm. N per 100 gm. soil. 
