Potatoes. 



(Tables 8 and 9.) 

 Variety "Saas". 



Field Experiment 1912. Conducted at the Experimental Station. Medium Loam. 



Strip K, Plots 5 and 6. Planted on the 27 "^ April. 

 Lifted on 10"' October. 

 Photographed on 7'*^ August. 



Even in the middle of July on plot 6, as on all similar plots, it was noticed that 

 the vegetation was unmistakably dark green, while a normal green colouring was 

 exhibited on plot 5, and the control plots. The leaves on plot 6 exhibited at the 

 beginning of August all those characteristic indications of deficiency in Potash as 

 they are shown on the lower half of Table 9. The leaves of the Potatoes on plot 5 

 showed in the beginning of August a bright green colour. At the end of August, 

 plot 6 had completely died down, while at this time plot 5 showed without ex- 

 ception still numerous bright green or yellow leaves. The plants on this plot died 

 only in the course of September. In the potato plant the evidences of Potash 

 starvation are as follows. The plants are retarded in growth and retain for a 

 remarkably long time their green colour. The internodes become shortened in 

 comparison with those of normally nourished plants, and the pinnate leaves are 

 closer to one another, than is the case in completely manured plants (Compare 



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