TOBACCO AND COTTON. 97 



Cotton. 



Tobacco. Fibre. Seed. Stalk. 



Phosphoric Acid 8-6 8-3 14-8 5-5 



Sulphuric Acid 9'3 5'6 1-6 0'5 



Lime 88'8 25-7 2'4 7-0 



Magnesia 25'0 14-5 5-6 2-2 



Potash 73-7 54-0 14-4 8-8 



Silica 23-0 1-3 3-4 2-5 



We regret that we could not obtain reliable 

 analyses of cotton and tobacco, showing the 

 amount of nitrogen or ammonia required. The 

 reader can see that in raising tobacco, a large 

 amount of lime and potash is required, while the 

 amount of phosphoric acid is small. The cotton 

 plant requires more phosphoric acid, but either 

 crop can be raised more readily and profitably 

 from ordinary soils, where climate is suitable, 

 than either wheat or corn. 



The foregoing Tables are of great value to the 

 farmer and planter, in showing them the amount 

 of the different valuable elements required by dif- 

 ferent crops; also, how far the commercial manures 

 of a known composition are able to supply the 

 material for these crops. If the reader wishes to 

 know how much of those elements which are 

 not usually applied as principal constituents of 

 manures, such as oxygen, hydrogen, chlorine, 

 iron, soda, and carbon, is required by plants, he 

 may refer to the Tables 6n pages 82 and 85, 

 which will show him the percentage of these 



