MANGANESE UNDER ACID AND NEUTRAL SOIL CONDITIONS. 9 
Table VII. — Effect of manganese sulphate on the yields of wheat, rye, timothy, beans, 
corn, cowpeas, and potatoes in 1915. 
Area and treatment. 
Wheat. 
Rye. 
Timo- 
thy. 
Beans. 
Corn. 
Cow- 
peas. 
Potatoes. 
Pods. 
Vines. 
Stover. 
Ears. 
Per square rod : 
Untreated 
Treated with 
MnS0 4 
Lbs. 
11 
14 
1,760 
2,240 
Lbs. 
18 
26 
2,880 
4,160 
Lbs. 
41 
45 
6,560 
7,200 
Lbs. 
25 
27 
4,000 
4,320 
Lbs. 
31 
34 
4,960 
5,440 
Lbs. 
48 
54 
7,680 
8,640 
Lbs. 
30 
33 
Bush. 

68 
75 
Lbs. 
31 
40 
4,960 
6,400 
Lbs. 
19 
19 
Bush. 
Per acre (calculated): 
Untreated 
Treated with 
MnSO.i 
40 
40 
The effect of manganese on all the crops in 1915 was somewhat 
similar to its effect in 1914. Considerable increases were produced 
Fig. 1. — Rye on an untreated plat. 
with each crop except potatoes. In this case the yield was the 
same in the check plat and manganese plat. Again the largest in- 
crease was secured with rye. 
OXIDATIVE POWER OF PLATS WITH AND WITHOUT MANGANESE 
UNDER NEUTRAL CONDITIONS. 
In July, 1915, samples of soil were taken from each plat, as previ- 
ously described for the work done in 1912, in order to determine the 
oxidizing power. The relative oxidation in the check plats and 
manganese plats is given in Table VIII. The check plat in each 
case is taken as 100 and compared with the manganese plat growing 
the same crop. 
