COMPOSITION OF VARIOUS FERTILIZERS. 233 



LEATHER SCRAPS are difficult to decompose, and decay 

 very slowly ; but they contain a large proportion of poten- 

 tial nitrogen, and when plow r ed into the soil slowly give it 

 up to the crops. 



The nitrogen they contain is thus of the least vafcie of any 

 kind used in fertilizers. As the leather is very cheap, it 

 has offered a temptation to some unscrupulous dealers in 

 fertilizers to mix it with their goods for the purpose 01 show- 

 ing on analysis, a large percentage of nitrogen; but as it is 

 practically unavailable, the quantity of nitrogen thus shown 

 is misleading, and unless explained is fraudulent. 

 COMPOSITION OF VARIOUS FERTILIZERS. PER CENT. 



4-^ O 



02 C 'C . ^ s3 c5 fe 



|?j | 1 1 | 1 | I | gg 



* | * * I 1 > 



Dried blow! 7.65 8.10 6.23 1.08 S36.64 



Bone and flesh.... 14.93 4.36" 10.52 4.91 32.01 



A sivd huffs!!...} 2- 30 13 - 67 30.82 11.63 15.24 21.65 50.30 



Ground bones 4.78 2.03 29.83 18.61 34.79 



Dried fish 9.24 6.20 40.00 



Dried flesh 12.05 1.96 50.00 



Ground horn 10.0013.53 1.36 2.00 25.28 



Wool Waste 17.71 3.66 34.00 



Soft coal soot 12.50 f!4. 73 1.5 4.5 *2.00 25.46 .05 



Cotton seed 13.00 3.50 3.50 3.00 20.00 



Cotfon seed meal.. 14.00 7.00 3.00 2.00 35.00 



* In the form of sulphuric acid. 



T As ammonia. 



