30 
BULLETIN 1180, U. S. DEPARTMENT OE AGRICULTURE. 
wide variations in fertility and the boll-weevil damage makes the 
slight differences insignificant. The results do not justify the makir 
of any distinctions between the merits of the three sources of nitrogen. 
Undoubtedly they are all very readily available, as is shown by Plate 
III, Figure 1. 
Results with corn. — The yields of corn given in Table 15 show just 
as inconclusive results as with cotton. The soil of series A and B was 
so fertile that the increases produced by fertilizers were insignificant. 
The yields on series C were somewhat lower than on the other two, 
due to the poorer soil, but the increases over the checks were quite 
good. Ammonium chlorid seemed to be an entirely satisfactory 
source of nitrogen. No conclusions can be drawn from the results 
with the two mixed salts. Plate IX, Figures 1 and 2, shows the rapid- 
ity with which these materials are utilized by corn. 
Table 15.— 
- Yields per 
acre of cotton and 
corn 
from Section II 
f field 
No. 2 
Plat. 
Yields of seed cotton 
(pounds). 
Plat. 
Yields of corn. 
Fertilizer ratio. 
Ac- 
tual. 
Aver- 
age. 
In- 
crease 
over 
check. 
Aver- 
age in- 
crease. 
Stalks 
(pounds). 
Grain (bushels). 
Actual. 
Aver- 
age. 
In- 
crease 
over 
check. 
Aver- 
age in- 
crease. 
Series A.— Mixed salt 
(from K2SO4): 
0-0-0 
16 
/ n 
\15 
12 
13 
14 
f 15 
\20 
17 
18 
19 
16 
{\l 
12 
13 
14 
f 15 
\ 20 
17 
18 
19 
16 
i U 
X 15 
12 
13 
14 
f 15 
\ 20 
17 
18 
19 
580 
716 
684 
828 
756 
1,000 
684 
396 
764 
580 
872 
340 
460 
408 
516 
660 
764 
408 
672 
616 
820 
1,076 
556 
204 
748 
444 
612 
952 
748 
1,024 
1,068 
1,048 
1,120 
580 
| 700 
828 
756 
1,000 
} 540 
764 
580 
872 
340 
} 434 
516 
660 
764 
} 540 
616 
820 
1,076 
556 
| 476 
444 
612 
952 
| 886 
1,068 
1,048 
1,120 
6 
M 
3 
4 
u 
7 
8 
9 
6 
U 
2 
3 
4 
H 
8 
9 
6 
3 
4 
8 
9 
2,720 
2,920 
2,840 
2,960 
2,640 
2,880 
2,840 
3,000 
2,960 
2,960 
3,120 
2,000 
2,880 
2,400 
2,640 
2,880 
2,780 
2,400 
2,480 
2,440 
2,520 
2,920 
1,040 
2,160 
2,120 
2,320 
2,360 
2,780 
2,120 
2,200 
2,200 
2,560 
2,720 
33.7 
30.3 
38.9 
32.0 
33.1 
37.1 
38.9 
36.6 
38.3 
39.4 
44.0 
22.9 
40.0 
26.3 
35.4 
36.6 
35.4 
26.3 
14.3 
20.6 
20.0 
26.9 
6.3 
16.6 
9.7 
14.9 
19.4 
22.3 
9.7 
13.1 
17.7 
22.9 
25.1 
33.7 
}34.6 
32.0 
33.1 
37.1 
J37.8 
38.3 
39.4 
44.0 
22.9 
} 33.2 
35.4 
36.6 
35.4 
| 20.3 
20.6 
20.0 
26.9 
6.3 
} 13.2 
14.9 
19.4 
22.3 
} 11.4 
17.7 
22.9 
25.1 
0-8-5 
1-8-5 
128 
56 
300 
-2.6 
-1.5 
2.5 
2-8-5 
4-8-5 
0-8-5 
1-8-5 
224 
40 
332 
176 
48 
316 
.5 
1.6 
6.2 
-1.1 
2-8-5 
.1 
4-8-5 
4.4 
Series B.— Mixed salt 
(from KC1): 
0-0-0 
0-8-6 
1-8-6 
82 
226 
330 
2.2 
3.4 
2.2 
2-8-6 
4-8-6 
0-8-6 
1-8-6 
76 
280 
536 
79 
253 
433 
.3 
-.3 
6.6 
1.3 
2-8-6 
1.6 
4-8-6 
4.4 
Series C— Ammo- 
nium chlorid: 
0-0-0 
0-8-4 
1-8-4 
-32 
136 
476 
1.7 
6.2 
9.1 
2-8-4 
4-8-4 
0-8-4 
1-8-4 
182 
162 
234 
75 
149 
355 
6.3 
11.5 
13.7 
4.0 
2-8-4 
8.9 
4-84 
11.4 
Field No. 3. 
This field, which was located quite near field No. 2, was used for 
experimental purposes during the seasons of 1920 and 1921. The 
soil was rather low and very widely different in productiveness on 
