14 BULLETIN 149, U. S. DEPARTMENT OP AGRICULTURE. 



from any experiments yet described that such elements can have any 

 practical application as a fertilizer in general farming. 



Evidence is given to show that the action of uranium on plants is 

 due to its chemical properties rather than to its property of being 

 radioactive, and that the conflicting results obtained with radio- 

 active manure from different sources is to be explained largely by 

 the presence of uranium, and of such nonradioactive constituents as 

 soluble salts and free acids. 



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