ATMOSPHERIOXITROGEX FERTILIZERS. 21 
Table 9.— Yields per acre of corn from Section I of field No. 1 in 1920 and 1921. 
Fertilizer ratio. 
Plat. 
Yields of corn. 
1921 
Stalks 
(pounds) 
Grain (bushels). 
Actual 
Aver- 
age. 
| Stalks. 
Increase (pounds) 
over 
check. 
Grain (bushels). 
Actual 
Aver- 
age. 
Increase 
over 
check. 
Series A.- 
trate: 
0-0-0. 
0-4-2. 
1-4-2. 
2^-2. 
Ammonium ni- I 
4-4-2 
Series B. — Sodium nitrate: 
0-0-0 
0-4-2 
1-4-2. 
2-4-2. 
4-4-2 
Series C. — Cyanamid (with 
acid phosphate applied 
separately): 
0-0-0 
0-4-2. 
1-4-2. 
2-4-2. 
4-4-2. 
840 
1,500 
1,320 
2,080 
2,080 
2,400 
2,440 
2,160 
2,440 
1,600 
2,040 
1,800 
2,720 
2,240 
2.800 
2,600 
3,200 
2,920 
1,720 
2,040 
1,280 
2,360 
1,920 
2,720 
2,560 
2,800 
3,000 
10.3 
10.3 
7.4 
15.4 
10.9 
17.1 
16.0 
22.9 
25.7 
18.3 
18.0 
14.9 
21.1 
15.4 
21.1 
20.6 
30.3 
30.9 
14.8 
15.4 
8.6 
12.6 
8.6 
16.6 
16.0 
28.0 
28.6 
10.3 
8.9 
13.2 
16.6 
24.3 
18.3 
16.5 
18.3 
20.9 
30.6 
14.8 
12.0 
16.3 
28.3 
! 
{ 
15.4 I 
7.7 
1.8 
4.4 
14.1 
-1.4 
4.3 
16.3 
1,040 
1,880 
1,600 
2,240 
2,120 
2,360 
2,160 
2,600 
2,480 
1,240 
2,160 
2,040 
2,400 
2,040 
2,600 
2,360 
2,640 
2,560 
1,120 
2,360 
1,760 
2,080 
2,000 
2,160 
2,200 
2,440 
2,280 
8.0 
13.1 
7.4 
19.4 
12.6 
21.7 
16.6 
25.7 
28.6 
14.9 
26.9 
18.9 
28.6 
22.3 
28.6 
28.6 
37.1 
37.1 
8.6 
20.6 
10.3 
20.6 
11.4 
21.1 
20.6 
29.7 
28.0 
8.0 
10.3 
16.0 
19.2 
27.2 
14.9 
22.9 
25.5 
28.6 
37.1 
8.6 
15.5 
16.0 
20.9 
28.9 
5.7 
8.9 
16.9 
2.6 
5.7 
14.2 
.5 
5.4 
13.4 
The relative percentages of grain and stover varied to a marked 
extent for the two seasons. In 1920 the wet period of early spring 
and summer was followed by a drought at the time of ear formation. 
A heavy stalk production without the corresponding grain yield was 
the natural result. Exactly reverse weather conditions in 1921 
gave a much larger proportion of grain. It will be noticed also that 
in Table 9, as well as in subsequent tables, there was a rather general 
tendency for small nitrogen applications to produce stalks rather 
than grain, particularly in 1920. 
CYANAMID AND AMMONIUM SULPHATE. — SECTION II. 
This series of plats was planned primarily to determine the advisa- 
bility of using cyanamid in mixture with either calcined phosphate 
or basic slag. However, during the season of 1921 it was impossible 
to secure sufficient calcined phosphate and it became necessary to 
use basic slag on all cyanamid plats. Ammonium sulphate was used, 
with acid phosphate as a standard for comparison. The experiments 
were conducted on the same soil used in 1919 for the time-of- applica- 
tion studies. Since acid phosphate was used on the plats at that 
time the later results can not be considered as an estimate of the 
