NUTRIENT REQUIREMENT OF THE POTATO 



333 



jars with opaque paper. The cultures were run in triplicate and 

 the solutions renewed every ten days. The plants were sealed 





£SV, 



Fig. 3. A potato plant grown from a sprout in water culture, showing the 

 formation of new tubers. 



in the stoppers so as to prevent the entrance of rain for the 

 experiment was carried out in the open because of the extreme 

 heat in the greenhouse at this season of the year. 



