22 



BULLETIN 1410, U. S. DEPARTMENT OF AGRICULTURE 



In the 1924 season all plats were fertilized as in 1923 and planted 

 to tobacco. In the crop-succession plats, tobacco consequently fol- 



Fig. 15. — Tobacco growing after timothy on plat 2-B at Whately, Mass., August 24, 



1923 



lowed two years of the respective crops on one half of each plat, 

 which in turn were preceded by several years of timothy sod. The 

 other half plat may be considered to be a measure of the residual 





Fig. 16. 



-Tobacco growing after corn on plat 12-B at Whatelv, Mass., August 24, 

 1923 ; plat 12-A, planted to corn, in the background 



effect from one years cropping to the respective crops, or as an 

 indication of the rate of recovery from brown root rot following 

 cropping to tobacco for one season. 



