1890.] PUBLIC DOCUMENT — No. 33. 215 



and deficiency of moisture on the development of the scab 

 can be instituted, as the whole field received the same 

 liberal natural watering. 



The first five columns of the following table show the 

 details of the planting of each section. It will be seen that 

 the plan afibrds material for the following comparisons of 

 results, as to the development of scab : 1. Deep vs. shallow 

 planting; 2. Susceptibility to attack of light and dark 

 skinned varieties ; 3. Barn-yard manure vs. commercial 

 fertilizers; 4. Efiect of tobacco dust in drill ; 5. Scabby 

 vs. smooth "seed." 



