Smithsonian Report, 1926.—Coville PLATE 10 
ALUMINUM-SULPHATE TREATMENT OF THE BLUEBERRY FOR THREE SEASONS 
The plant at the left has been in an ordinary rich garden soil for three seasons. It is small, 
pallid, and half dead. The plant at the right, healthy and ready to bear fruit the coming 
year, isin the same soil as the other, except that it received each year, at the time of repotting, 
an application of aluminum sulphate, which changed the soil reaction from neutral to acid 
About one-third natural size 
