20 
BULLETIN 42, U. S. DEPARTMENT OF AGRICULTURE. 
the results secured should not be considered as unduly influenced 
by irregularities due to nonuniformity of the soil in different plots. 
The soil is inclined to be of an acid nature. 
The manganese sulphate was applied at the rate of 50 pounds per 
acre. The untreated and treated plots received the same cultivation. 
The corn, cowpeas, and potatoes were planted in the spring of each 
year and harvested in the fall. The wheat and rye were planted in 
the fall and harvested the next July. This experiment has now run 
for six years, each crop on the same plot each year. That is, con- 
tinuous culture of one crop on the same plot was practiced. The 
manganese was applied each year after the ground was broken and 
the land was cultivated before planting. 
EFFECT OF MANGANESE SULPHATE ON WHEAT. 
Manganese sulphate was applied to the plot, 1 square rod, in 
September, 1907, at the rate of 50 pounds per acre shortly before it 
was planted to wheat. The crop was harvested in July of the follow- 
ing year and the soil was plowed and again prepared for wheat plant- 
ing in September. The manganese sulphate was applied to the same 
plot each year before planting. The results of five years are given 
in Table XI. The weight of the unthr ashed straw and grain only 
was taken. The first column gives the year. The second and third 
columns give the yields of the manganese and untreated plots in 
pounds per square rod. The yields of the two plots are calculated 
to pounds per acre and given in the fourth and fifth columns. The 
last column gives the increase or decrease of the manganese plot from 
the untreated plot in pounds per acre. 
Table XI. — Showing the effect of manganese sulphate on wheat grown in soil treated Jive 
successive years. 
Yield of crop per 
square rod. 
Calculated yield per acre. 
Year. 
Manganese 
sulphate. 
Untreated. 
Manganese 
sulphate. 
Untreated. 
Increase or 
decrease of 
manganese 
plot. 
1908 
Pounds. 
27 
23 
22 
21 
15 
Pounds. 
31 
26 
25 
25 
24 
Pounds. 
4,320 
3,680 
3,520 
3,360 
2,400 
Pounds. 
4,960 
4,160 
4,000 
4,000 
3,840 
Pounds. 
- 640 
1909 
- 480 
1910 
— 480 
1911 
- 640 
1912 
-1,440 
In each year the manganese caused a decrease in yield. As shown 
in the last column in the table, the decrease in 1908 was 640 pounds 
per acre; in 1909 and 1910 the decrease was 480 pounds; in 1911 it 
was 640 pounds; and in 1912 it was 1,440 pounds. 
