178 



INDEX. 



Station work, reorganization on project basis 

 Station work, utilization of . 



Apple scab control .... 

 Bulletin on insecticides and fungicides 

 Nursery certification plan 

 Tobacco wildfire control . 

 Sulfate of ammonia, thirty years' experience with: 

 Appendix .... 

 Conclusions .... 

 Crops grown: 



Corn ..... 



Grass and clover 



Millet, Japanese barnyard 



Oats 



Potatoes .... 



Soy beans .... 



Fertilizer treatment 



History of plots 



History of plots in 1919 and 1920 



Lime treatment 



Nitrate of soda compared with no nitrogen and sulfate of ammonia 



No nitrogen compared with nitrate of soda and sulfate of ammonia 



Soil conditions ......... 



Sulfate of ammonia, compared with nitrate of soda and no nitrogen 

 Sulfate of ammonia, peculiar effects of 

 Yields on no-nitrogen plots 

 Yields on sulfate of ammonia plots . 

 Timothy v. meadow fescue under varying drainage conditions 

 Tobacco investigations .... 



Tobacco wildfire, investigations on control 

 Tobacco wildfire, preliminary report of investigations: 

 Appearance of the disease 

 Cause of wildfire 

 Dissemination 



Handling by workmen 

 Insects .... 



Leaf contact 



Rain .... 



Wind .... 



Life history of the causal organism 

 Incubation period 

 Infection 

 Origin of the disease in seed-beds 

 Source of infection in the field 

 Control .... 



Aeration and watering of beds 

 Disinfection of seed 

 Dusting plants in the bed 

 Fertilizer relatif)ns 



Removal of diseased plants or leaves from the field 

 Seed-bed, necessity of starting with 

 Selecting plants from disease-free beds 

 Spraying or dusting plants in the bed 

 Conclusions .... 



Spraying results by growers 

 Substances used and results 



