64 
Journal of Agricultural Research 
Vol. XXVIII, No. 1 
Table XIII .—Ammonijication and nitrification of urea in the presence of guanyl - 
urea sulphate 
SOIL ALONE (250 GM.) 
Time 
Ammonia 
mgm. N 
Nitrates 
mgm. N 
Recovery of Nitrogen <* 
As 
ammonia 
mgm. N 
As 
nitrates 
mgm. N 
Total 
mgm. N 
Days 
0.. 
1.31 
.83 
.54 
.17 
.18 
.00 
.31 
3.07 
1..... 
10.. 
5.08 
7.04 
5.92 
8.50 
9.66 
19....... 
31.. 
50. 
100..... 
UREA 26.15 MGM. N 
1.. 
28.43 
27.60 
10.... 
22.37 
14.26 
21.83 
9.18 
31.01 
19...,... 
10.00 
22.65 
9.83 
15.61 
25.44 
31... 
3.86 
27.88 
3.68 
21.96 
25.64 
50..... 
1.88 
30.88 
1.88 
22.38 
24.26 
100..... 
1.93 
34.37 
1.62 
24.71 
26.33 
GUANYLUREA SULPHATE 13.05 MGM. N 
1..... 
,53 
.70 
10....... 
.41 
5.92 
13 
.84 
.71 
19....... 
.20 
7.83 
.03 
.79 
.82 
31. 
.45 
8.71 
.27 
2.79 
3.06 
50..... 
.54 
10.84 
.54 
2.34 
2.88 
GUANYLUREA SULPHATE 26.1 MGM. N 
1.40 
.57 
.76 
6.36 
.22 
1.28 
1.50 
.18 
7.64 
.01 
.60 
.61 
.45 
8.29 
.27 
2.37 
2.64 
.48 
10.29 
.48 
1.79 
2.27 
GUANYLUREA SULPHATE 52.2 MGM. N 
1 ........ 
1.62 
.79 
10... 
3.16 
6.09 
2.62 
1.01 
3.63 
19......... 
1.66 
8.71 
1.49 
1.67 
3.16 
31......... 
1. 75 
8.21 
1. 57 
2.29 
3.86 
50...'..... 
.65 
| 
9.02 
.65 
.52 
1.17 
GUANYLUREA SULPHATE 13.05 MGM. N—UREA 26.15 MGM. 
1.... 
26.49 
24.96 
10... 
28.69 
11.06 
28.28 
5.14 
33.42 
19....... 
22.15 
18.60 
21.95 
10.77 
32.72 
31... 
19.43 
24.04 
18.98 
15.33 
34.31 
50....... 
12.98 
28.32 
12.44 
17.48 
29.92 
GUANYLUREA SULPHATE 26.1 MGM. N-UREA 26.15 MGM. N 
1....... 
26.75 
25.35 
10....... 
30.44 
10.21 
29.68 
3.85' 
33.53 
19. 
27.68 
16.75 
27.50 
9.11 
36.61 
31... 
25.57 
20.17 
25.12 
11.88 
37.00 
50... 
20.61 
23.54 
20.13 
13.25 
33.38 
GUANYLUREA SULPHATE 52.2 MGM. N—UREA 2G.15 MGM. N 
1... 
25.70 
24.08 
10....... 
31.20 
8.71 
28.04 
2.62 
30.66 
19. 
27.88 
12.32 
26.22 
3. 61 
29.83 
31... 
30.13 
15.93 
28.38 
7.72 
36.10 
50. 
27.58 
20.07 
26.93 
11.05 
37.98 
a The figures for the recovery of nitrogen apply to urea only, where guanylurea sulphate and urea were 
used together 
