126 Report of the Acting Director and Chemist of the 



We shall, therefore, consider ander the general head given above 

 the following topics : 



1. Explanation of terras used in stating guarantee-analyses of 

 fertilizers. 



2. Total constituents of fertilizers. 



8. Commercial valuation of fertilizers. 



4, How to calculate amounts of materials to be used in making 

 home-made fertilizers. 



1. Explanation of Terms used in Stating Guarantee- Analyses 



OF Fertilizers. 



In examining the guarantee-analyses of different manufacturers, 

 we find much vajiation in the terms used. Some forms are simple, 

 stating only the most essential points, while others are complicated 

 and confusing to the average farmer. We propose here briefly to 

 explain all the different forms which are apt to be met. The fol- 

 lowing list contains most of the terms used in stating manufacturers' 

 guarantee-analyses : 



Nitrogen is expressed as 



(a) Nitrogen, (b) ammonia, (c) nitrogen equal (or equivalent) to 

 ammonia. 



Phosphoric Acid is expressed as 



(a) Phosphoric acid, (b) soluble phosphoric acid, (c) reverted 

 phosphoric acid, (d) precipitated phosphoric acid, (e) avail- 

 able phosphoric acid, (f) soluble and available phosphoric 

 acid, (g) insoluble phosphoric acid, (h) total phosphoric 

 acid, (i) phosphoric acid equal (or equivalent) to bone 

 phosphate of lime. 



Potash is expressed as 



(a) Potash, (b) potash (actual), (c) potash s. (or sul.), (d) potash 

 (soluble), (e) potash as sulphate, (f) potash equal (or equiv- 

 alent) to sulphate of potash, (g) sulphate of potash, (h) 

 potassium oxide. 



Nitrogen. 



{a) Nitrogen is a gas and, in this form, can not be used in fertil- 

 izers. Therefore, whenever we speak of nitrogen in fertilizers, we 

 do not mean that nitrogen exists in them as simple nitrogen. As 



