96 AMERICAN MANURES. 



Ammonia 52-00 Ibs. 



Phosphoric Acid.. 19-76 " 

 Sulphuric Acid... 7*50 " 



Lime 75-00 Ibs. 



Magnesia . . 21-00 " 



Potash 8069 " 



Silica 18-65 Ibs. 



Clover requires a large amount of potash and 

 ammonia, while the amount of silica required is 

 small. Great benefits are realized by growing 

 this crop ; it sends its roots deep into the soil, 

 and brings up the phosphate and sulphate of 

 lime, also potash and magnesia ; and when the 

 clover is plowed under, as a green manure, it 

 furnishes a large amount of the nitrogen ^re- 

 quired for a heavy crop of wheat. 



All Root Crops require a rich soil to do well. 

 Twenty tons of Turnips or Carrots, with the tops, 

 which is a large crop for an acre, require : 



Turnips. Carrots. 



Ammonia 42-00 Ibs. 48-00 Ibs 



Phosphoric Acid 45-00 " 39-00 



Sulphuric Acid 50-00 " 57'00 



Lime 90-00 " 197-00 



Magnesia 14-00" 29-00 



Potash . . . -. 140-00 " 134-00 



Silica 55-00 " 60'00 



Tobacco and Cotton require a rich soil to 

 grow luxuriantly, as the following Table, showing 

 the amounts, in pounds, of inorganic elements 

 contained in 1000 Ibs. of the stems and leaf of 

 tobacco, and the fibre, seed and stalk of cotton, 

 in their air-dried state, will show : 



