I HE CHEMIST RY OF THE BOIL. 



Ill 



Comparative Value of Farmyard Manure and Artificial 



Manures. 



Tne following comparison of the relative manurial value of farmyard 

 manure and a typical complete artificial fertiliser on the market may be 

 found useful. 



One ton of farmyard manure contains, roughly, the following quantities of 

 fertilising ingredients : — 



Nitrogen 8 Hi 



Potash 6 lb. 



Phosphoric acid ... ... ... ... ... ... (> lb. 



Tn 3 cwt. of the artificial fertiliser there are of — 



Nitrogen ... 9 11). 



Potash 6 lb. 



Phosphoric acid ... ... ... ... ... 42 lb. 



That is to say, •'! cwt. of the fertiliser contains about the same quantities of 

 nitrogen and of potash, and seven times the quantity of phosphoric acid, 

 as 1 ton of farmyard manure. 



The manurial ingredients in the artificial products are in a very soluble 

 form and their effect is more rapid. On the other hand, they contain no 

 vegetable matter like the litter in farmyard manure. 



A Few General Hints. 



When purchasing a manure, always insist on a guarantee of its composition 

 as determined by analysis. 



Artificial manures should be mixed with about three times their weight of 

 dry loam, and distributed evenly. 



Never add lime to a manure containing sulphate of ammonia or blood and 

 bone manures, as in these cases loss of nitrogen results ; and when lime has 

 been applied to the land, do not use manures until about three weeks 

 afterwards. 



The accompanying fertiliser diagram, which represents in a graphic manner 

 the points to be taken into consideration in the mixing of different manures, 

 is reproduced in the hope that it will be found useful to farmers who make up 

 their own mixtures. 



Superphosphate 



Thomas 'mojpmatj 



PV>tash 

 Salts 



Nitrate of 5oo« 



Substances connected by thick, line must not be mixed together. 



Substances connected by double line must only be mixed immediately before use. 



Substances connected by single thin line may be mixed together at any time. 



