106 



Composition of the principal commercial fertilizing materials. 



J. Supplying nitrogen : 

 Nitrate of soda 

 Sulphate of ammonia 

 Dried blood (high grade) 

 Dried blood (low grade) ... 

 Concentrated tankage .. 

 Tankage (bone) 

 Dried fish scrap 

 Cotton-seed meal 

 Castor pomace 



2. Supplying phosphoric acid 

 South Carolina rock phos 



phate 



South Carolina rock super- 

 phosphate (dissolved 

 South Carolina rock 

 phosphate) 



Florida land rock phos- 

 phate 



Florida pebble phosphate 

 Florida superphosphate 

 (dissolved Florida phos- 

 phate) 

 Boneblack 



Boneblack superphosphati 

 (dissolved boneblack) .. 

 Ground bone 

 Steamed bone 

 Dissolved bone 

 Thomas slag (1) 



3. Supplying potash : 

 Muriate of potash 

 Sulphate of potash (high 



grade) 



Sulphate of potash and 

 magnesia 

 Kainit 

 Sylvinit 



Cotton-hull ashes (2) 



Tobacco stems 



Nitrogen. 



a vana- 

 ble phos 

 phoric 

 acid. 



Insolu- 

 ble phos 



phoric 



acid. 



Total 

 phospho- 

 ric acid. 



Potash. 



Chlorin. 



Per cent. 



Percent. 



Per cent. 



Per cent. 



Per cent 







Per cent. 



16. 5 tol6 













19 to 20.5 













12 to 14 













10 to 11 







3 to" 5 







11 to 13.5 







1 to 2 







K in ft 







1 1 10 14 







7 to 9 







6 to 8 







6.5 to 7-5 



... 





1.5 to 2 



2 to" 3 





5 to 6 







1 to 1.5 



1 to 1 .5 









26 to 28 



26 to 28 







... 



12 to 15 



1 to 3 



13 to 16 







... 



... 



33 to 35 33 to 35 





... 







26 to 32 



26 to 32 







... 



14 to 16 



1 to 4 



16 to 20 





... 







*2 to 36 32 to 36 



... 





... 



15 to 17 



1 to 2|17 to 18 



... 





2.5 to 4.5 



5 to 8 



15 to 17 20 to 25 



... 



... 



1.5 to 2.5 



6 to 9 



16 to 20 22 to 29 



• •• 



... 



2 to 3 



13 to 15 



2 to 3 



15 to 17 



• •• 



... 





... 





11.4to 23 



... 



... 











50 



45 to 18 











48 to 52 



5. to 15 











26 to 30 



1.5 to 2& 











12 to 12.5 



30 to 32 











16 to 20 



42 to 46 









7 to 9 



20 to 30 











1 to 2 



i 2 to 8 











1 to 1.5 



1 to 2 





2 to 3 







3 to 5... 



| 5 to 8 





(1) In good Thomas slag at least 80 per cent of the phosphoric acid should be soluble 

 in ammonium citrate, i e., available. 



(2) Cotton-hull ashes contains about 10 per cent of lime, unleached wood ashes 30 to 

 35 per cent, and leached wood ashes 35 to 40 per cent. 



