4 BULLETIN 441, U. S. DEPARTMENT OF AGRICULTURE. 
Table I shows that wheat was reduced in yield each year by the 
manganese, the decrease varying from 480 to 1,440 pounds per acre. 
With rye, the yield was increased in 1909, 1911, and 1912, and was 
decreased in 1908 and 1910. With corn, there was a decrease each 
year except 1907, when the yield of stover was larger. The growth 
of cowpeas was also decreased, this decrease varying from 160 pounds 
per acre in 1912 to 2/240 pounds hi 1908. Potatoes were likewise 
affected, there being a smaller yield hi the manganese plat each year 
except in 1909, when there was an increase over the check plat of 
40 bushels per acre. 
Acidity tests of the various plats were made hi 1912. The results 
of these determinations show that the manganese tests were made 
under acid conditions. 
The lime-requirement determinations were made by means of the 
Veitch method. 1 Table II shows the amount of lime required 
according to this method for each plat to produce a neutral condition 
in the soil. The soil in each plat required approximately a ton of 
lime per acre. Where wheat was grown, the manganese and the 
untreated plats had the same lime requirement. Where rye, corn, 
and cowpeas were grown, the manganese plats had a higher lime re- 
quirement than the untreated plats. With rye, the manganese plat 
required 2,492 pounds and the untreated plat 2,136 pounds of lime 
per acre. With corn, the manganese plat required 2,492 pounds and 
the untreated plat 1,780 pounds per acre. With cowpeas, the man- 
ganese plat required 2,492 pounds and the untreated plat 2,136 
pounds per acre. Where potatoes were grown, the untreated plat 
had a greater lime requirement than the manganese plat, the man- 
ganese plat requiring 2,451 pounds of lime per acre and the untreated 
plat 2,743 pounds. 
Table II. — Lime(CaC0 3 ) requirement per acre of the various plats, to a depth of 6 inches. 
Plats. 
Wheat. 
Rye. 
Corn. 
Cowpeas. Potatoes. 
Treated vrith mflTig r anpse 
Pounds. 
1.780 
1.7S0 
Pounds. 
' 2. 492 
2.136 
Pounds. 
2.492 
1. 780 
Pounds. 
2. 492 
2.136 
Pounds. 
2.451 
Untreated 
2.743 
1 Veitch. F. P. The estimation of soil acidity and the lime requirements of soils. In Jour. Amer. Chem. 
Soc. v. 24, no. 11. p. 1120-1128. 1902. 
Comparison of methods for the estimation of soil acidity. In Jour. Amer. Chem. Soc., v. 26, 
no. 6, p. 637-662. 1904. 
