46 
Journal of Agricultural Research 
Vo!. XXVIII, No. i 
water and 200 cc. aliquots distilled. Each distillation, therefore, represented 
only 2 to 3 mgm. of the original cyanamid nitrogen in the case of the smallest 
applications. 
Table IV.— Ammonification and nitrification of varying quantities of treated and 
untreated cyanamid 
Treatment 
Incuba¬ 
tion 
period 
Ammonia 
mgm. N 
Nitrates 
mgm. N 
Recovery of N 
Ammonia 
mgm. N 
Nitrates 
mgm. N 
Total 
mgm. N 
Soil alone... 
Days 
0 
2 
5 
10 
19 
31 
50 
100 
150 
200 
1.52 
.08 
1.07 
.84 
1.20 
1.33 
.65 
1. 21 
.79 
.26 
1.64 
3.39 
4. 55 
6.36 
6. 72 
8.53 
11.36 
16.01 
19.29 
20.78 
Do_______ 
Do...... 
Do____ 
- 
Do_____ 
Do........... 
Do.......-.. 
Do...... 
Do........ 
Do....... 
NITROGEN ADDED—6.52 MGM. PER 250 GM. SOIL 
Cyanamid treated... 
10 
1.52 
9.32 
0.68 
2.96 
3.64 
Do—...... 
19 
1.48 
14.38 
.28 
7.66 
7.94 
Do......—. 
31 
.74 
16.16 
-.59 
7.63 
7.04 
Do...-... 
50 
1.15 
19.16 
.50 
7.80 
8.30 
Cyanamid untreated... 
10 
3.18 
9.17 
2.34 
2.81 
5.15 
Do... 
19 
1.21 
16.06 
.01 
9.34 
9.35 
Do...... 
31 
.65 
18.93 
—.68 
10.40 
9.72 
Do..... 
50 
.86 
21.35 
.20 
9.99 
10.19 
NITROGEN ADDED—13.04 MGM. PER 250 GM. SOIL 
Cyanamid treated. 
10 
6.89 
8.75 
6.05 
2.39 
8.44 
Do. 
19 
1.38 
19.10 
.18 
12.38 
12.56 
Do...... 
31 
.74 
24.77 
-.59 
16.24 
15.65 
Do... 
50 
1.00 
27.72 
.35 
16.36 
16.71 
Cyanamid untreated. 
10 
8.22 
8.83 
7.38 
2.47 
9.85 
Do. 
19 
1.34 
20.04 
.14 
13.32 
13.46 
Do... 
31 
1.02 
24.83 
-.31 
16.30 
15.99 
Do.- 
50 
1.02 
26.51 
.37 
15.15 
15.52 
NITROGEN ADDED—26.08 MGM. PER 250 GM. SOIL 
Incu¬ 
Cyan¬ 
amid 
Recovery of N 
Treatment 
bation 
period 
and di- 
cyan- 
amid 
mgm.N 
Test for 
cyanamid 
Urea 
mgm.N 
Am¬ 
monia 
mgm.N 
INI-* 
trates 
mgm.N 
Am¬ 
monia 
mgm.N 
Ni¬ 
trates 
mgm.N 
Total 
mgm.N 
Cyanamid treated_ 
Days 
2 
8.48 
Present. 
0.37... 
8.22 
2.26 
7.42 
—1.13 
15.14 
Do___ 
5 
1.87 
None_ 
None.. 
13.18 
2.61 
12.11 
-1.94 
12.04 
Do.... 
10 
.89 
...do_ 
—do... 
10.47 
4.72 
9.63 
—1.64 
8.88 
Do.... 
19 
.80 
_do.. _ 
_do... 
6.52 
12.26 
5.32 
5.54 
11.66 
Do__ 
31 
.59 
—do. 
_do_ 
1.39 
24.77 
.06 
16.24 
16.89 
Do.. 
50 
.56 
...do. 
_do... 
.32 
36.27 
—.33 
24.91 
25.14 
Do__ 
100 
.00 
_do_ 
...do... 
1.21 
40.03 
.00 
24.02 
24.02 
Cyanamid untreated, _ 
10 
12.90 
8.85 
12.06 
2.49 
14. 55 
Do... 
19 
4.23 
21.32 
3.03 
14.60 
17.63 
Do__ 
31 
1.02 
34.45 
—.31 
25.92 
25.61 
Do..... 
50 
1 . 10 
38.21 
.45 
26.85 
27. 30 
Do.. 
100 
1 . 21 
43.75 
.00 
27.74 
27.74 
