MAK^GAXESE UNDER ACID AND NEUTEAL SOIL CONDITIONS. 3 



paths 2^ feet wide separating the plats. One strip, or a series of 

 seven plats, was treated with manganese sulphate; the other strip 

 of seven plats was not treated and served as a control, or check. 

 Seven crops, rye, wheat, timothy, clover, com, cowpeas, and pota- 

 toes, were grown on both the treated and untreated plats, which he 

 side by side in the two strips. The crops on the plats were not 

 rotated, but each crop grew year after year on the same plat. The 

 manganese sulphate was apphed annually, before the crops were 

 planted, at the rate of 50 pounds per acre. Tlie corn, cowpeas, and 

 potatoes were planted m the spring of each year and harvested m 

 the fall, and the wheat and rye were planted in the fall and harvested 

 the next July. The timothy and clover plats were planted m 1907, 

 and the gTOund was agam plowed and reseeded m 1909. 



The results for the six years from 1907 to 1912, inclusive, are 

 given briefly in Table I and wiU permit a short discussion here, 

 the reader being referred to the earher pubhcations previously men- 

 tioned for the results in. detail. The yields are calculated to pounds 

 and bushels per acre and are so given m the table. The wheat and 

 r3'e were not thrashed, the yield being given in weight of straw plus 

 gram. Tlie timothy and the clover were a failure on this soil; these 

 plats produced practically no yield and no results were obtained. 



Table I. — Effect of manganese sulphate on the yields per acre of wheat, rye, cowpeas, 

 corn, and potatoes on an acid soil treated for six successive years (1907 to 1912, 

 inclusive) . 





Wheat. 



Rye. 



Cowpeas. 



■^'ear. 



L'n- 

 treated. 



Treated 



with 

 mangan- 

 ese sul- 

 phate. 



Increase 



or de- 

 crease of 

 mangan- 

 ese plat. 



Un- 

 treated. 



Treated 



with 

 mangan- 

 ese sul- 

 phate. 



Increase 



or de- 

 crease of 

 mangan- 

 ese plat. 



Un- 

 treated. 



Treated 



with 

 mangan- 

 ese sul- 

 phate. 



Increase 

 or de- 

 crease of 

 mangan- 

 ese plat. 



1907 



Pounds. 



Pounds. 



Pounds. 



Pounds. 



Pounds. 



Pounds. 



Pounds. 

 8,320 

 8,800 

 5,920 

 4,320 

 6, 720 

 3,360 



Pounds. 

 6,720 

 6,560 

 4,480 

 3,360 

 5, 600 

 3, 520 



Pounds. 

 -1,600 

 -2,240 

 -1,440 



- 960 

 -1,120 



- 160 



190S 



19(« 



1910 



1911 



1912 



4, 960 

 4, 160 

 4,fXX) 

 4,000 

 3, MO 



4,320 

 3,680 

 3, .520 

 3, .360 

 2,400 



- 640 



- 480 



- 480 



- 640 

 -1,440 



5,280 

 4, 160 

 1,920 

 3, 680 

 2, 210 



4,160 

 4,640 

 1,600 

 4,000 

 2,720 



-1,120 



-1- 480 

 - 320 

 -t- 320 



-t- 4 80 





Com. 



Potatoes. 



Year. 



Untreated. 



Treated with man- 

 ganese sulphate. 



Increase or de- 

 crease of man- 

 gane.se plat. 



Un- 

 treated. 



Treated 



with 

 mangan- 

 e.se sul- 

 phate. 



Increase 



or de- 

 crease of 





Stover. 



Grain. 



Stover. 



Grain. 



Stover. 



Grain. 



e.so plat. 



1907 



1908 



1909 



1910 



1911 



1912 



Pounds. 

 9,120 

 4, \m 

 4, .320 

 0,240 

 4,WX) 

 ft, 440 



Bushels. 



m 



71 

 20 

 40 

 40 

 46 



Pounds. 

 10, 4(K) 

 3, :}60 

 3, 040 

 4,. 320 

 4,0(K) 

 2,72(J 



Bushels. 

 40 

 .'.1 

 17 

 23 

 20 

 9 



Pounds. 



-t 1,280 



- 8(M) 



- 1 , 280 



-1,920 

 - 800 

 -2,720 



Bushels. 

 -20 

 -20 

 - 3 

 • -17 

 -20 

 -37 



Bushels. 

 221 

 120 



181 



147 

 2i3 



85 



Bushels. 

 152 



80 

 221 



96 

 152 



61 



Bushels. 

 -60 

 -10 

 -1-40 

 -51 

 -91 

 -21 



