EG YP1 JAA A (i HI C UL 1 'URE. 



forms, while in the refuse manures under consideration 

 they exist in varying degrees of availability; it is therefore 

 necessary to make allowance for this by considering 75% 

 of the nitrogen in these manures to be available and fiG - fi 

 of the phosphoric acid. Thus we have in their case: 



1 unit of nitrogen worth 46^ P.T. 



1 .. phosphoric acid worth 11{, .. 



Making use of these figures we find that the value ot 

 these manures is as follows : 



In the case of this last manure the nitrogen is practically 

 equal to that in nitrate of soda so that its value works 

 out to 625 P.T. per ton. 



