makganese undee acid and neuteal soil conditions. 7 



experiment was conducted as in previous years. Manganese sulphate 

 was applied each year in amoimts of 50 pounds per acre and the same 

 crops were grown on the same plats as before except on the clover 

 plats, wliich were planted in string beans. The timothy plats were 

 again plowed' and reseeded. 



In September, 1912, the plats were limed, using 500 pounds per 

 acre CaCOg in excess of the amounts required by the soil as determined 

 by the Yeitch method, given in Table II. The manganese sulphate 

 was apphed to the wheat, rye, and timothy plats on September 15, 

 and the plats and their checks were seeded. The corn, cowpea, bean, 

 and potato plats received their applications in the spring of 1913, 

 shortly before seeding time. 



The results for 1913 are given in Table IV. 



Table IV. — Effect of manganese sulphate on the yields of wheat, rye, timothy, beans, 

 corn, cowpeas, and potatoes in 191S. 



Area and treatment. 



Wheat. 



Rj-e. 



Tim- 

 othy. 



Beans. 



Corn. 



Cow- 

 peas. 







Pods. 



Vines. 



Stover. 



Ears. 





Per square rod: 



Lbs. 

 13 



n 



2, oso 

 1,760 



Lhs. 

 15 



14 



2,400 

 2,240 



Lbs. 

 36 



38 



5,760 

 6,080 



Lbs. 

 15 

 17 



2,400 

 2,720 



Lbs. 



18 

 18 



2,800 

 2,800 



Lbs. 

 24 

 21 



3,840 

 3,360 



Lbs. 

 13 

 11 



Bush. 



30 

 25 



Lbs. 

 32 

 29 



5,120 

 4,640 



Lbs. 

 24 

 21 



Bush. 



Treated with MnSOj.. 

 Per acre (calfulated;: 

 Untreated 



64 



Treated \nthMnS 04.. 



56 



The results show that the manganese sulphate has again depressed 

 the yield, but only slightly as compared with previous years. The 

 only cases where the manganese plats produced larger yields were 

 with timothy and beans, but the differences are very small. 



The soil was again examined for acidity early in August and the 

 wheat, rye, corn, cowpea, and potato plats were again found to be 

 acid ; the timothy and string-bean plats, however, were neutral. This 

 was true of both the check plat and the manganese-treated plat. 

 Th(! lime requirement of the different plats, expressed in pounds of 

 CaCOg per acre, is given in Table V. 



Tahi.k \'. — Lime {('a(!()-_^) refjuirem^nt per arrc of Ihr different plats to a drplh. of 6 inches. 



Plats. 



Wheat. 



Rye. 



Timothy. 



Beans. 



Corn. 



Cowpeas. 



Potatoes. 



rntrpated 



Pounds. 



l,4fK) 



\,m) 



Pounds. 



l.OfM) 

 1.2()<) 



Neutral . 

 ...do 



Neutral . 

 ...do 



Pounds. 



1,200 



700 



Pounds. 

 900 

 900 



J'0U7ld». 



1,200 



Treated with MnSOi 



901) 











The amounts of lime added in the fall of 1912 were not sufficient to 

 keep this soil neutral during the n(!xt growing season except in the 

 two cases nicnl ioncd, iuid it is noted that tlicsci jitc tlie two pluts on 

 \vlij<li the niangunese ])roduced tlu; increase over its check. 



