OFFICIAL INSPECTIONS 74. 229 



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 w^ater 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 poor 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 inactive, 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 ni- 

 trogen 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. 7. 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. 



