Halsted : Mycological Notes 



71 



Year 



Plot I 



Plot 2 



Plots 



Plot 4 



Plot 5 



Plot 6 



Sound Clubbed Sound Clubbed Sound Clubbed Sound Clubbed Sound Clubbed Sound Clubbed 



1894 



1S95 

 1S96 



■1897 115 

 1898 



99 



53 I 

 91 o 



o 



86 o 



Total 444 3 



95 37 



42 81 



I 90 



34 81 



14 77 



1S6 366 



75 



135 



87 

 117 



77 

 491 



II 



7 

 I 



I 



lOI 



91 

 25 



14 

 36 



65 



64 34 



22 



2S1 149 



120 

 132 



77 

 124 



68 

 521 



3 

 5 



4 



14 



127 



79 

 22 



151 

 _67 



503 



II 



54 

 56 



44 

 28 



156 



It is seen that the amount of diseased roots was much less 

 upon the limed than the unlimed belts. It will be fair to take the 

 first four plots thus dealing with equal areas with lime and without, 

 and under these conditions it is seen that the two limed belts in 

 1894 gave 1 3 pounds of clubbed roots to 5 i pounds when no treat- 

 ment was made. The next year shows a greater difference In favor 

 of the limed belts, for in 1895 the yield of diseased roots stood for 

 the treated 8 pounds to 1 17 pounds for the untreated belts. 



In 1 896 there was one pound to 155 in favor of the limed belts, 

 and in 1897 the results wei-e practically the same, here, how^ever, 

 one of the check belts was employed for testing the susceptibility 

 of other cruciferae to the Plasmodiophora. In 1898 there were 

 two pounds of clubbed roots upon the limed belts to ill where 



r 



there was no treatment. 



It is seen from the table that the larger amount of lime (belt i) 

 produced only 3 pounds of clubbed turnips and the half amount 

 of lime (belt 3) yielded 22 pounds, which exceeded the belt with 

 a quarter amount of the lime, namely, 37^ bushels per acre. 

 From this test for five years it seems that 3 5 bushels of lime 

 per acre is ample to keep the club-root from the land even when 

 the susceptible crop is grown continuously, and two crops each 

 season for at least five years without diminished strength. 



By combining the two treated and two check belts the follow- 

 ing- table is constructed : 



Year. 

 1894 



t895 

 1896 



1897 

 1898 



Timited Belts. 



Untreated Belts. 



ound. 



Clubbed. 



Sound. 



Clubbed. 



174 



13 



196 



SI 



18S 



8 



133 ■ 



117 



178 



I 



26 



155 





I 



68 



(162) estimated. 



163 



2 



78 



Ill 



Totals. 935 



25 



501 



596 



