CLOVER HAY. 



95 



Tubers. 



Ammonia 21-00 Ibs. 



Phosphoric Acid 33'00 

 Sulphuric Acid. 12-60 



Lime 4-20 



Magnesia 7*80 



Potash 109-00 



Silica 13-00 



Twenty bushels of wheat require 15 Ibs. of 

 phosphoric acid for the grain, and 11 Ibs. for the 

 straw ; while 100 bushels of potatoes require 

 double this amount. Hence, two medium crops 

 of wheat exhaust only as much of this valuable 

 element as one crop of potatoes. Also, only one- 

 sixth the amount of potash required for potatoes 

 is necessary for the wheat crop. In raising pota- 

 toes, few farmers supply a sufficient amount of 

 phosphoric acid and potash, Hence, this plant 

 and its tubers have become constitutionally 

 deteriorated on most farms, and liable to speedy 

 decay. A bushel of potatoes contains only about 

 one-seventh the amount of nitrogen contained in 

 a bushel of wheat, and its nutritive value for the 

 production of blood and muscle is in the same 

 proportion. 



CLOVER HAY. 



Two tons, or 4000 Ibs., of dried clover may be 

 considered an average crop per acre. This 

 amount contains : 



