CONTENTS. 



History of plots, 



Soil conditions, 



Fertilizer and lime treatment, . 



Yields on no-nitrogen plots, 



Yields on sulfate of ammonia plots, 



Crops grown: 



Corn, 



Oats, 



Soy beans, 



Potatoes, 



Grass and clover, 



Japanese barnyard millet. 

 Summary of results \)y crops, . 

 History of the plots in 1919 and 1920, 

 Peculiar effects of sulfate of ammonia. 

 Comparative effects of nitrate of soda, sulfate of ammonia, and no nitrogen 

 Conclusions, ........... 



Appendix, . . . . . . • • 



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