Potatoes. 



100 

 Great Harpenden Field, 1922. 



Comparison of Varieties. 



Comparison of Manurial Treatment. 



PROFESSOR BLACKMAN'S 

 ELECTRO CULTURE EXPERIMENTS. 



Cereal Crops. 



Plots. 



Dressed Grain, 



Yield 

 per Acre. 



Bushels. 



Weight 

 per Bush. 



lb. 



Offal 



Grain 



per Acre. 



lb. 



Straw per Acre. 



Straw. 



lb. 



Total 

 Straw. 



Proportion 



of 

 Total 

 Grain 



to 

 100 of 

 Total 

 Straw. 



Oats (Grey Winter). Foster's Field, 1921. 



Electro-Culture 

 Control I. ... 

 Control II. ... 



930 



101-4 



960 



Wheat (Red Standard). Foster's Field, 1922. 



Electro-Culture 

 Control, North East 

 Control, South East 



669 

 72-1 

 81-5 



Barley (Plumage Archer). Great Knott Field, 1922. 



Electro-Culture 

 Control 



341 

 32-4 



49- 1 

 486 



273 

 244 



1808 

 1840 



22-2 

 22*3 



78-2 

 72-8 



