12 MAINJB AGRICULTURAL EXPERIMENT STATION. I905. 



Yield plot C, soluble Bordeaux i^ pounds copper sulphate, 

 97 barrels. 



Yield plot D, soluble Bordeaux % pound copper sulphate, 

 91 barrels. 



Yield plot E, regular Bordeaux, 120 barrels.* 



The potatoes on plot D were smaller than on the other plots 

 and the skins of many of them darkened somewhat, resembling 

 rot. Still, only a very few were rotten. 



The experiments at the Wisconsin Station, through unavoid- 

 able complications, were a failure. In experiments upon potatoes 

 made at the New York (Geneva) Experiment Station in 1903 

 the yields per acre were as follows : Unsprayed, 107 bushels 

 per acre ; soluble Bordeaux, 118 bushels per acre ; soda Bordeaux 

 mixture, 160 bushels per acre; regular Bordeaux mixture, 175 

 bushels per acre. 



CONCLUSIONS. 



The soluble Bordeaux of equal strength to regular Bordeaux 

 mixture costs much more, both in materials and labor, than regu- 

 lar Bordeaux mixture. The yields were smaller and the quality 

 inferior from the plots sprayed with soluble Bordeaux. For 

 both of these reasons its use is not recommended. 



* Yield not taken by a station officer. 



