MANGANESE UNDEE ACID AND NEUTEAL SOIL CONDITIONS. 9 



Table ^'II. — Effect of manganese sulphate on the yields of wheat, rye, timothy, beans, 

 corn, coivpeas, and potatoes in 1915. 



Area and treatment. 



Wheat. 



Rye. 



Timo- 

 thy. 



Beans. 



Corn. 



Cow- 

 peas. 







Pods. 



Vines. 



Stover. 



Ears. 





Per square rod : 



Untreated 



Treated with 

 MnSOi... 



Lhs. 

 11 



14 



1,760 



2,240 



LU. 



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 (CRlculated): 



Untreated 



Treated with 

 MnSCi 



40 

 40 











The effect of manganese on all the crops m 1915 was somewhat 

 similar to its effect m 1914. Considerable increases were produced 



Fig. 1.— Rye on an untreated plat. 



with each crojp 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, 1015, 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 

 inungiincse plats is given in Tabl(5 VIII. Tlie chec^k plat in each 

 case is taken as 100 and compared with the manganese plat growing 

 the same crop. 



