May IS. 1919 Influence of Soil Environment on Rootrot oj Tobacco 59 



The first application was made on June 18, 1917. The appUcations 

 were made by hand, disked, and harrowed in. The lime was previously 

 allowed to slake in the field. Connecticut Havana tobacco was trans- 

 planted on all the plots on June 27. Acidity determinations made one 

 month after the applications showed slightly increased acidity for the 

 acid plots and slightly decreased acidity for the alkaline plots. Determin- 

 ations unfortunately were not made at the end of the season, but the 

 tests for the following year served to indicate that, although the changes 

 were not great in degree, they were decidedly effective in bringing about 

 a marked change in reaction between the alkaline and acid plots. 



In the first year's tests the acid plots in the infested soil showed up 

 decidedly the poorest throughout most of the growing period, while the 

 heavily limed plot was decidedly the best in the series. On the new field 

 the fertilizers both with and without lime gave somewhat better results 

 than the controls. So far as can be judged by the results, the acid ferti- 

 lizers were not injurious to the crop on this soil although it is possible, of 

 course, that these materials might have had some direct injurious action 

 on the tobacco in the case of the infested soil. Apparently, such a condi- 

 tion did not occur on the uninfested soil, nor on the infested soil when 

 the plots treated in the same manner were limed. 



The plots were harvested and cured separately; the yield of cured 

 leaves for 191 7 are given in Table IV. 



TablB IV. — Yield of tobacco on soil with acid fertilizers , with and without lime, igiy-lS 



" 1917 series. These plots received a second application of same amounts in 1918 and had, therefore, the 

 residual effect of the 191 7 appUcations. 



The results were sufficiently interesting to warrant repetition the fol- 

 lowing season (1918) on a slightly increased scale. All the plots were 

 again given an additional application, the same amounts as in 1 917 being 

 used. In the infested field six plots were added, these being given 



