lo Feb., 1910.] Artificial Manures Acts. 



s. d. 



I per cent, of insoluble phosphoric acid ... ... 29 



I per cent, of phosphoric acid in fine bone (in bonedust or 



bonemeal) ... ... ... ... ... 40 



I per cent, of phosphoric acid in coarse bone (in bonedust 



or bonemeal) ... ... ... ... ... 29 



1 per cent, of potash as sulphate ... ... ... 5 4 



I per cent, of potash as chloride ... ... ... 4 5 



Method of Calculating the Commercial Value of a Manure. 

 The average commercial value per ton of a manure sold in Victoria is 

 obtained by multiplying the percentages stated of the fertilizing substances 

 by the corresponding unit values fixed therefor, and adding the separate 

 values together. Examples: — 

 I. Sulphate of Ammonia- — 



Invoice certificate, 20.5 per cent, nitrogen — 

 Calculation — 



20.5 X 14/6 ... ... ... ... ^14 17 3 



Calculated value per ton .. ... ;^i4 17 3 



2. SuperpJiospJiatc — 



Invoice certificate, 17.46 per cent, phosphoric acid 



(water soluble) 

 [nvoice certificate, 1.16 per cent, phosphoric acid 



(citrate soluble) 

 [nvoice certificate, i.oo per cent, phosphoric acid 



(insoluble) 

 Calculation — 



Phosphoric acid (water .soluble) 17.46 x 4/6 . 



Phosphoric acid (citrate soluble) 1.16 x 4/ 



Phosphoric acid (insoluble) i.oo x 2/9 



Calculated value per ton ... ... ;^4 6 o 



3. Bonedust — 



Invoice certificate, 3 per cent, nitrogen, 18.5 per 



cent, phosphoric acid. 

 Mechanical Condition : 30 per cent, fine, 70 per 

 cent, coarse. 

 Calculation — 



Nitrogen 3x12/ ... ... ... ^1160 



Phosphoric acid — 

 Fine 18.5 x 30 



== 5-55 X 4/ ... ... \ 2 2 



100 

 Coarse 18.5 x 70 



12.95 X 2/9 



Calculated \a\ue per ton ... ... ^4 13 9 



The unit value system enables a farmer to readily ascertain if the price 

 asked for a manure is its reasonable com.raercial value. The term " com- 

 mercial value" must not be confu.sed with the "agricultural value" of a 

 manure. The commercial value represents the value of a manure according 

 to its composition, while the agricultural value is measured by the extent 

 of the increase in quantity and quality produced by it in a particular soil 

 under certain conditions. The agricultural value is liable to great variation, 



