Plate I. — CHAnACTSR of Vegetation on Unlimed Plots, 1920. 



Photo, by R. L. Coffin. 

 Witli sulfate of ammonii). Yield per acre, ?,f)20 pounds. 



Photo, by R. L. Coffin. 



With nitrate of soda. Yield per acre, 4,180 pounds. 



