ATMOSPHERIC-NITROGEN FERTILIZERS. 
23 
Results with corn. — The yields from the group of plats given in 
Table 11 show increases in favor of cyanamid over ammonium 
sulphate regardless of whether the former material was used with 
calcined phosphate or basic slag. A portion of the increase may be 
attributed to the fact that the two cyanamid series were located 
on slightly lower ground than the other series. Nevertheless, 
there is no doubt that under the conditions cyanamid was just as 
satisfactory a source of nitrogen for corn as ammonium sulphate. 
It seems that corn is able to utilize ammonia nitrogen, while cotton 
requires a large percentage of nitrate nitrogen for its best growth. 
Table 11. — Yields per acre of corn from Section II of field No. 1 in 1920 andl921. 
Fertilizer ratio. 
Plat 
No. 
Yields of corn. 
1920 
1921 
Grain (bushels). 
Stalks 
(pounds) 
Actual 
Aver- 
age. 
In- 
over 
check. 
Stalks 
(pounds) 
Grain (bushels). 
Actual, 
Aver- 
age. 
In- 
crease 
over 
check. 
Series A. — Ammonium sul- 
phate: 
0-0-0 
0-4-2. 
2-4-2. 
4-4-2. 
Series B.— Cyanamid (with 
calcined phosphate): J 
0-6-0 
0-4-2. 
1-4-2. 
2-4-2. 
4-4-2. 
Series C — Cyanamid (with 
basic slag): 
0-0-0 
0-4-2. 
1-4-2. 
2-4-2. 
4-4-2. 
960 
2,220 
1,800 
2,720 
2,240 
3,000 
2,720 
2,600 
2,480 
1,240 
1,560 
2,360 
2,800 
2,680 
3,200 
2,800 
3,080 
2,840 
1,120 
2,240 
2,880 
3,480 
3,320 
3,440 
3,520 
3,880 
3,280 
6.3 
13.7 
14.3 
19.4 
16.0 
22.9 
14.9 
26.9 
21.7 
11.4 
6.3 
12.6 
20.0 
17.7 
18.3 
22.3 
24.6 
27.4 
20.6 
22.3 
30.3 
26.9 
28.6 
28.1 
38.3 
34.3 
14.0 
17.7 
18.9 
24.3 
3.7 
4.9 
10.3 
18,9 
9.4 
20.3 
10.8 
26.0 
16.5 
9.7 
21.5 
2S.6 
7.1 
28.4 
6.9 
36.3 
14.8 
2,120 
1,880 
2,320 
2,040 
2,400 
2,240 
2,640 
2,480 
920 
1,880 
1,920 
2,0S0 
2,120 
2,240 
2,240 
2,160 
2,080 
840 
1,680 
2,160 
2,560 
2,320 
2,480 
2,640 
2,6S0 
2,400 
5.1 
20.0 
14.9 
22.3 
16.0 
25.7 
18.3 
34.9 
28.6 
9.7 
9.7 
18.3 
23.4 
21.1 
25.7 
25.1 
30.9 
30.3 
8.0 
17.1 
24.6 
34.3 
29.7 
32.6 
36.6 
38.3 
36.6 
5.1 
| 17.5 
19.2 
22.0 
} 31.8 
9.7 
\ 14.0 
22.3 
25.4 
30.6 
8.0 
20.9 
32.0 
34.6 
37.5 
1.7 
14.3 
8.3 
11.4 
16.6 
11.1 
13.7 
16.6 
1 Basic slag was substituted for calcined phosphate in 1921. 
MIXED SALTS, SODIUM NITRATE, UREA, AMMONIUM SULPHATE, AND CALCIUM NITRATE. 
SECTION III. 
This series of fertilizer experiments was carried out on the area 
used during the season of 1919 for the miscellaneous crop tests. This 
previous treatment did not seem to affect appreciably the results for 
the following two years. 
