OFFICIAL INSPECTIONS 80. I4I 



1. The nitrogen from nitrates. In this column is given the 

 percentage of nitrogen present as nitrate. Nitrate nitrogen is 

 wholly and quickly available. 



2. Nitrogen from ammonia salts. In this column is given 

 the nitrogen from ammonium salts, chiefly sulphate. Ammonia 

 nitrogen is not as quickly available as nitrate nitrogen. 



3-4-5. Organic Nitrogen. The organic nitrogen is valuable 

 in proportion as the percentage of the active is greater than the 

 inactive, and the amount of water soluble is large or small. A 

 fertilizer showing more than twice as much active as inactive 

 insoluble nitrogen would be rated as high grade. Also in one 

 carrying a quite large percentage of water soluble and small 

 amounts of active and inactive water insoluble the nitrogen 

 would be likewise rated as high grade. One showing a small 

 amount of water soluble and a larger amount of inactive than 

 active would be classed as a pood grade of organic nitrogen. 

 The percentage of inactive as compared with the total organic 

 is the measure of the value of the organic nitrogen in the 

 goods. With a fair amount of organic nitrogen soluble in 

 water, a large per cent of active and a small amount of in- 

 active, the organic nitrogen is considered good. If but a small 

 amount is soluble in water and less active than inactive is 

 found the organic nitrogen would be considered low -grade. 



3. Water soluble organic nitrogen. This is the soluble 

 nitrogen from organic materials, such as dried blood, dried fish 

 or meat, tankage, cottonseed meal, etc. It dissolves in water 

 and is quickly and completely available to the plant. 



4. Active water insoluble organic nitrogen. The nitrogen 

 in this column is that portion of the organic nitrogen which is 

 insoluble in water but is converted into ammonia by the action 

 of permanganate of potash. It is quite available. 



5. Inactive organic nitrogen. This is the portion of the 

 organic nitrogen that is not converted into ammonia by the 

 action of the permanganate solution. It is only slowly available. 



6. Total nitrogen found, j. Total nitrogen guaranteed. 

 Phosphoric Acid. The table shows the percentages of water 



soluble, insoluble in weak acid found, and of available and 

 total phosphoric acid found and guaranteed. 



Potash. The table shows the percentages of water soluble 

 potash found and guaranteed. 



