154 



MAIXE AGRICULTURAL EXPERIMENT STATION". 



contained twenty per cent or above of starch and fourteen had 

 less than fifteen per cent. The greater number of the samples 

 carried between 15.50 and 17.50 per cent. The average was 

 16.50 per cent. 



In fifteen samples of Norwegian grown potatoes,* the starch 

 ranged from 12.3 to 20.3 per cent with an average of 14.91 per 

 cent. In still another lot of Norv\-egian potatoesf consisting of 

 122 samples, 20 samples contained less than 13.19 per cent 

 of starch, 22 samples contained less than 14.15 per cent, 

 38 samples contained less than 15.06 per cent of starch and 42 

 samples had over 17 per cent. The highest percentage found 

 was 20.59 Pci" cent. 



The aA-erage of 20 samples examined by the Halle ''Germany) 

 Experiment Station Avas 19.77 pe^ cent of starch with a range 

 from 17.72 to 22.78 per cent. 



From the above comparisons it is evident that the potatoes 

 which were sprayed were full higher in starch than most others 

 which have been examined. If the per cent and a half more of 

 starch found in the sprayed than in the unsprayed potatoes was 

 due to the treatment of the vines, and no other explanation sug- 

 gests itself, this alone is a strong argument in favor of spraying. 



FERTILIZING MATERIALS REMOVED BY A CROP OF POTATOES. 



Ash analyses of four samples of the potatoes are given on 

 page 150. These results, calculated to the fresh potato, are 

 given in the table which follows : 



FERTILIZING 



CON'STITUENTS OF POTATOES CALCULATED T': 

 CONTENT OF FRESH POTATOES. 



WATER 



Tarietv. 



Wiite Elephant. 

 White Elephant . 

 White Elephant . 



3W5 

 3047 

 3050. 



White Elephant j 3051 



Average 



% 

 .34 



.33 



.29 



.28 



.31 



% 

 12 



11 



15 



12 



13 



* Experiment Station Record, Vol. 6, p. 410. 

 fExperiment Station Reconi, Vol. 5, p. 1017. 



% 

 .41 



.43 



.56 



.48 



% 



.01 

 .01 

 .01 

 .01 

 .01 



