MANURED U81 



nitrogen. The article in this country is guaranteed to 

 contain 10% of nitrogen, and is offered at GOO P.T. per 

 ton. It decomposes readily in the soil and must be looked 

 upon as a valuable fertiliser. It is especially esteemed in 

 horticulture, -and is looked upon as very suitable for 

 sugar-cane. 



Powdered horn. Horn is rich in nitrogen, though it 

 is in a very insoluble state. It is sometimes ground to a 

 very fine powder and composted with horsa-manure or 

 with lime before use, to help to break down the nitrogen 

 it contains into simpler forms. This considerably increases 

 its value. The percentage of nitrogen varies from 8 to 14^. 



In France, what is known as "torrefied" horn is pro- 

 duced, that is horn which has been subjected to the action of 

 steam. This is also manufactured in this country and sold 

 under a guarantee of 12% nitrogen for 550 P.T. per ton. 



Special manure. This, consisting of a mixture of dried 

 blood, meat meal, bone meal, is sold for 450 P.T. per ton. 

 and contains 4 to 5% of nitrogen and 10 to 12% phos- 

 phoric acid. 



It is interesting to compare the prices of these manures 

 with the cost of a mixture of nitrate of soda and super- 

 phosphate of the same effective composition. If we assume 

 for the sake of comparison that nitrate of soda containing 

 16% of nitrogen costs P.T. 1000 par ton and that 

 sup2r phosphate containing 17 % of phosphoric acid costs 

 P.T. 292 J- per ton it will be seen that: 



1 unit i. e. 1% per ton of nitrogen costs 62| P.T. 



1 i.e.\% phosphoric acid costs 17 ., 



Now the nitrogen in nitrate of soda and the phosphoric 

 acid in superphosphate are both in their most available 



