38 



This table shows that some of the fertilizers having a low ac- 

 tivity of the water insoluble nitrogen, actually have a high activity 

 of the total nitrogen. This would indicate that a small amount of 

 some low grade organic material had been used perhaps as a condi- 

 tioner to keep the goods in a suitable mechanical form. Results 

 on other brands indicate that in the selection of the organic ammoni- 

 ates used in the fertilizer, not enough attention was paid to the ac- 

 tivity or availabilit}^ of the product. The table shows that in the 

 interpretation of results obtained by the laboratory method one 

 should be in possession of the full analytical data relating to the nitro- 

 gen. This is emphasized in the discussion as to quality of nitrogen 

 found on page 28 of this bulletin. 



