22 
BULLETIN 42, U. S. DEPARTMENT OF AGRICULTURE. 
EFFECT OF MANGANESE SULPHATE ON CORN. 
Six years' results have been secured with corn. The manganese 
was applied in the spring of 1907, before the planting of corn. The 
ground, as in the other test, was thoroughly prepared, and the crop 
was cultivated throughout the growing season. Manganese sulphate 
was applied each year at the rate of 50 pounds per acre. 
Table XIII gives the yields of stover and grain for the manganese 
and the check plots. The first column gives the year of growth, the 
second and third the yields for the manganese plot. The fourth and 
fifth columns give the yields for the untreated plot. The results have 
been calculated to pounds per acre of stover and bushels per acre of 
shelled corn. In making the calculations from pounds per square 
rod to bushels per acre, 56 pounds was taken as the weight of a bushel 
of shelled corn. These results are given in columns 6, 7, 8, and 9. 
The last two columns give the increase or decrease of stover and 
grain per acre on the manganese plot. 
Table XIII. — Effect of manganese sulphate on corn grovm on soil treated six successive 
years. 
Yield per square rod. 
Calculated yield per acre. 
Year. 
Manganese 
sulphate. 
Untreated. 
Manganese 
sulphate. 
Untreated. 
Increase or 
decrease of 
manganese plot. 
Stover. 
Grain. 
Stover. 
Grain. 
Stover. 
Grain. 
Stover. 
Grain. 
Stover. 
Grain. 
1907 
1908 
1909 
1910 
1911 
1912 
Pounds. 
65 
21 
19 
27 
25 
17 
Pounds. 
14 
18 
6 
8 
7 
3 
Pounds. 
57 
26 
27 
39 
30 
34 
Pounds. 
21 
25 
7 
14 
14 
16 
Pounds. 
10,400 
3.360 
3. 040 
4; 320 
4.000 
2,720 
Bushels. 
40 
51 
17 
23 
20 
9 
Pounds. 
9,120 
4,160 
4,320 
6,240 
4,800 
5,440 
Bushels. 
60 
71 
20 
40 
40 
46 
Pounds. 
+ 1.280 
- '800 
-1,280 
-1,920 
- 800 
-2,720 
Bushels. 
-20 
-20 
- 3 
-17 
-20 
-37 
The only increase from manganese noted was in 1907, when there 
was an increase of 1,280 pounds of stover per acre. However, there 
was a decrease in grain. The effect of the manganese sulphate was 
to decrease the yield of both stover and grain in the following five 
years. In 1907 the decrease in grain was 20 bushels per acre. In 
1908 stover was decreased 800 pounds per acre and the grain 20 
bushels per acre. In 1909 the stover was decreased 1,280 pounds 
and the grain 3 bushels per acre. In 1910 the decrease of stover was 
1,920 pounds and the grain 17 bushels. In 1911 the decrease of 
stover was 800 pounds and the grain 20 bushels. In 1912 the de- 
crease of stover was 2.720 pounds and the grain 37 bushels per acre. 
EFFECT OF MANGANESE SULPHATE ON COWPEAS. 
As with the corn plots, the manganese sulphate was applied to the 
cowpea plots beginning in the spring of 1907. Six years' results have 
been secured. Manganese sulphate was applied each year at the 
rate of 50 pounds per acre before planting. 
