42 SUPPLEMENT. 



a corresponding feeding of press-cakes alone. The value of 

 press-cakes and preserved leaves for the support of live stock, 

 particularly during a period when food as a general rule 

 becomes scarce and thus expensive, must be quite apparent ; 

 especially when we consider farther that every ton of sugar-beets 

 raised furnishes 400 pounds of press-cakes and 400 pounds of 

 fresh leaves, and that an ordinary factory consumes from 40 to 

 50 tons of beet roots per day during five months. In cases 

 where stock feeding is no part of the enterprise, or where plenty 

 of other kinds of food is at hand, the leaves while still green 

 are plowed under. The part which the beet leaves perform in 

 the absorption of mineral constituents from the soil may be 

 seen from the following analytical statement : — 



A fair average crop of sugar beets abstracts per acre, — 



By Roots and Leaves. 



Returned inform of Leaves. 



Phosphoric acid, . . . .10 pounds. 



Potassa, 38 « 



Lime and magnesia, . . . 31.5 " 

 Silica, 94 " . 



The General Influence of the Sugar-Beet Cultivation on 

 THE Condition op the Soil. 

 The first question which will be forced upon us in this con- 

 nection, is: Can the sugar-beet be raised upon the same lands 

 continuously without reducing their value either for the pro- 

 duction of sugar beets or for general farm management ? 



