A PLAN 

 FOR COOPERATIVE RESEARCH 

 ON THE SALT REQUIREMENTS 



OF 



REPRESENTATIVE AGRICULTURAL 

 PLANTS 



Prepared for a Special Committee 



OF THE 



Division of Biology and Agriculture 



OF THE 



National Research Council 



EDITED BY 



BURTON E. LIVINGSTON 



DR. A. G. McCALL, 



LABORATORY FOR SOIL INVESTIGATIONS, 



un;v?=f?s!ty of M^RVLANP, 



, . M t'GE PARK. MD. 



SECOND EDITION 



BALTIMOKB 

 1919 





