21 



1 Another sample of this brand. No. 1150, showed no commercial deficiency. 

 - Three other analyses of this brand were well up to the minimum guarantee. 

 ' One other sample of this brand showed no commercial deficiency. 



QUALITY OF PLANT FOOD IN AMMONIATED SUPERPHOS- 

 PHATES. 



Nitrogen. — The average total nitrogen found in ammoniated super- 

 phosphates was 3.51 per cent, made up as follows: — 



Nitrogen as nitrates and ammoniates, 1 . 74 



Total organic nitrogen, 1 . 77 



Water soluble organic nitrogen, 49 



Active water insoluble organic nitrogen, 73 



Inactive water insoluble organic nitrogen, 55 



Total nitrogen, 3.51 



The a\'erage total nitrogen in ammoniated superphosphates had a percent- 

 age activity of 84.3; the total organic nitrogen, 68.9; and the water insoluble 

 organic nitrogen, 57. 



Phosphoric Acid. — The average total phosphoric acid found in am- 

 moniated superphosphates was 11.81 per cent; 81.8 per cent of this was 

 found in available form, and about 58.1 per cent of the available phosphoric 

 acid was in water soluble fonn. 



