172 * BOARD OF AGRICULTURE. 



By Roots Alone. 



Phosphoric acid 25 lbs. 



Potassa 126 lbs. 



Lime and magnesia 32 lbs. 



Silica 6.5 lbs. 



Returned by Leaves. 



Phosphoric acid 10 lbs. 



Potassa 38 lbs. 



Lime and magnesia 31.5 lbs. 



Silica 9.4 lbs." 



The following tables from Champion and Pellet, give a good 

 idea of the quantity of mineral substances abstracted from the 

 soil by beet crops of different richness in sugar. 



Quantity of Salts taken up by a Beet Crop of 50,000 Kilo- 

 grammes OF Roots to the Hectare. 



From the above tables it is evident of what immense manurial 

 value the beet leaves may be if no other use is found for them. 

 Also the press-cake, that is, the organic and mineral part of the 

 beet left after the juice has been extracted, is of great manurial 



