130 



THE PRINCIPLES OF AGUICULTUPxE. 



coiisidcrcd. We sliould also take into account its ma- 

 mirial value, or value as a fertilizer. 



Any kind of food has a certain value as a fertilizer, 

 and may be used directly for tluit purpose if it is not 

 too expensive. 



Cotton-seed is extensively used in this ^vay in the South. 



The manurial value, as in ordinary fertilizers, is de- 

 termined by the amount of nitrogen, ])hosphoric acid, 

 and ])otash contained. 



The Ibllowiuu' tal)le shows the nunilicr of ])ounds of 

 the three substances contained in one ton of each vai'icty 

 of food, and the manurial value of a ton. This value is, 

 of course, variable, dej)ending upon the market value of 

 the three substances for the localitv and the season. 



Manurial SnhMances in a Ton of Food, and their ]'alue. 



Kinds of Food. 



rottoii-sced meal 

 Lii)sf(_(l tncul . 

 Wlieut brail . . 

 Beans . . . . 



l^eas 



Oats 



Barlev . . . . 

 Wliea't . . . . 

 Indian corn . . 

 Buckwlicat . . . 



Average liay . . 

 Tiniotliy liay . . 

 Dead ripe liay 

 f'lovcr liay . 

 Bean straw . 

 ( )at straw . . . 

 Wlieat straw . . 

 Corn fodder . . 



Potatoes . . . 

 Turnips . . . 



