450 



THE MANGOLD- WURZEL CROP. 



Way and Ogston, in the series of ash analyses of the 

 Royal Agricultural Society, and is thus given : T 



Assuming, therefore, an average crop of mangold to 

 yield 20 tons of roots and 4 tons of tops, we, should find 

 that, according to the foregoing analysis of the composi- 

 tion of the mineral portions of the crop, it had removed 

 from the field the following principal substances, in 

 about the quantities now given : 



Ibs. 



Potash, 133 



Soda, 70 



Lime, 21 



Magnesia, 22 



Phosphoric acid, 21 



Sulphuric acid, 22 



Chloride of Sodium, 160 



The organic composition of the mangold has been well 

 worked out by our chemists. The first investigations 

 were carried on in Professor Johnston's laboratory, by 

 Mr. Cameron and by Dr. Fromberg. According to the 

 analysis of the latter, the percentage of flesh-forming 

 (nitrogen) compounds was found to be as follows : 



Long Red, 1'60 per cent. 



Red Globe, 2-12 



Orange Globe, 1'94 



Roy. Agri. Soc. Jour., vol. viii. p. 184. 



