OE^FICIAI, INSPE;CTI0NS 42. 1 29 



Expi,ANATioN OF the; Tablss. 

 Under the head of "Nitrogen" in the tables are found eight 

 columns of figures under the following headings : 



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

 percentage of nitrogen present as nitrate. See page 123. 

 Nitrate nitrogen is wholly and quickly available. 



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

 the nitrogen from ammonium salts, chiefly sulphate. See page 

 123. Ammonia nitrogen while not usually as quickly available 

 to the growing plant as nitrate nitrogen is completely available. 



3. Water soluble organic nitrogen. This is the nitrogen 

 from organic materials, (See page 123) such as dried bloody 

 dried fish or meat, tankage, cottonseed meal, etc. It dissolves 

 in water and is supposed to be quickly and completely available 

 to the plant. 



4. Active zvater insoluble organic nitrogen. The nitrogen 

 in this column is that j)ortion of the organic nitrogen which is 

 insoluble in water but is converted into ammonia by the action 

 of the permanganate of potash solution. This is probably quite 

 readily available to plants. 



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 probably only slowly 

 available to plants. 



6. Available or active nitrogen. In this column is given the 

 sum of the percentages found in the first four columns, viz: 

 nitrate nitrogen, ammonia nitrogen, water soluble organic nitro- 

 gen and active water insoluble organic nitrogen. 



7. Total nitrogen found. 



8. Total nitrogen guaranteed. 



Phosphoric Acid. Under the head of "phosphoric acid" are 

 given the usual columns with the exception that inverted and 

 insoluble phosphoric acids are this year omitted. If it is 

 desired to know what the insoluble phosphoric acid is it may be 

 found by subtracting the available from the total as given in 

 the table. If it is desired to know what the reverted phos- 

 phoric acid is for a given sample this may be found by sub- 

 tracting the soluble phosphoric acid from the available. 



Potash. No change is made in the arrangement of the potash 

 results. 



