I02 Journal of Agriculture. [8 Feb., 1908- 



If an invoice does not state whether the nitrogen in the manure is in 

 the form of nitrate, or sulphate, or blood, or bones, it is to be assumed 

 to have the value of bone nitrogen. 



Unit Value- 

 s. d. 

 I per cent, of water soluble phosphoric acid ... ... 4 9 



I pex cent, of citrate soluble phosphoric acid in Thomas phos- 

 phates, nitro-superphosphates, ordinary superphosphates, 

 guanos and fine bone ... ... ... ... 40 



I per cent, of insoluble phosphoric acid in Thomas phosphates, 



superphosphate, guanos, and coarse bone ... ... 2) ^ 



I per cent, of insoluble phosphoric acid in ordinary super- 

 phosphates and nitro-superphosphates ... ... 10 



I per cent, of potash ... ... ... ... 56 



Method of Calculating the Commercial Value of a ^Ianure. 



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

 is obtained by multiplying the percentages stated of the fertilizing sub- 

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

 separate values together. Examples: — 



1. Sulphate of ammonia. Invoice certificate. 18 per cent, nitrogen — 



Calculation: 18 x 14s. ... ... ... ^^12 [2 o- 



Calculated value per ton ... ... ... t2I2o> 



2. Superphosphate — 



Invoice certificate 20 per cent, phosphoric acid (water soluble). 

 ,, ,, 2\ ,, ,, ,, (citrate soluble). 



,, ,, lA- ,. ,, ,, (insoluble). 



Calculation — 



Phosphoric acid (water soluble), 20 x 4s. 9d. ... 7^4 15 o 



,, ,, (citrate soluble), 2^ x 4s. ... o 10 O' 



,, ,, (insoluble), i^ x is. ... ... o i 6 



Calculated value per ton ... ... ^5 6 6 



3. Bonedust — 



Invoice certificate, 5 per cent, nitrogen, 20 per cent, phosphoric 



acid. 

 Mechanical condition: 30 per cent, fine, 70 per cent, coarse. 



Calculation — 



5 X 30 

 Nitrogen — Fine = 1-5 x 12s. = £0 18 o 



ICO 



=; x 70 



Coarse = 3.5 x gs. 6d. = 113 3 



100 

 20 x 30 



Phosphoric acid — Fine = 6 x 4s. = 140 



100 

 20 X 70 



Coar.se = 14 x 3s. 6d. = 290 



100 



Calculated value per ton ... ... ... £6 4 5 



