98 AMERICAN MANURES. 



substances ; and from these he can readily calcu- 

 late the amount required by different crops for 

 an acre. 



Every crop should be supplied with the full 

 amount of all the substances needed to bring it 

 to maturity. That this vital principle is not 

 understood, or at least attended to,, is painfully 

 evident from an examination of the statistics 

 furnished in the reports of the Agricultural De- 

 partment, at Washington. By these reports we 

 find that the average of the amounts of the 

 different crops raised on an acre in thirty States 

 of the Union is, as follows : 



Wheat 11-56 bushels. 



Indian Corn. 28-00 " 



Rye. 13-30 



Oats 23-95 " 



Barley 19*14 bushels. 



Buckwheat. 17-68 " 

 Potatoes... 93-23 " 

 Hay 1-28 tons. 



The above averages show conclusively that 

 there is a great necessity for a more extended 

 use of manufactured manures. 



Even Pennsylvania, that boasts of her fertile 

 soils and the perfection of her system of agricul- 

 ture, produces only the following average of the 

 above named crops per acre : 



Wheat 12-8 bushels. 



Eye 13-0 



Barley 21-4 



Potatoes 88-0 " 



Indian Corn.. .35*0 bushels. 



Oats 27-8 



Buckwheat. . 16'5 " 

 Hay 1-3 tons 



But this will favorably contrast with South 



