434 University of California Publications in Agricultural Sciences [Vol. 1 



Copper Carbonate Series (1908), Corn 



Containino- traces of copper, .0025%. 



Copper Carbonate Series (1908), Squash 



Fig. 9. — Corn cultures grown in soils containing copper as sulpliide (chalco- 

 cite), from none to 1. per cent Cu. 



