MANURES. 



257 



shows the comparative richness of pigeon manure and 

 ordinary sebach beladi, each calculated to 5 ^ of 

 moisture: 



PIGEON MANURE COMPARED WITH SEBACH BELADI. 



Pigeon manure is therefore at least 15 times richer in 

 nitrogen, 10 times as rich in phosphoric acid and twice 

 as rich in potash as sebach beladi. It is sold by the 

 ardeb of 145 kilos, the price varying, generally speaking, 

 from 40 to 50 P.T. per ardeb. This is equivalent to 

 about P.T. 315 per ton. As much as 7 ardebs is sometimes 

 used per feddan. It decomposes quickly in the soil and 

 is therefore very suitable for those crops which do not 

 occupy the land for a long period. Though comparatively 

 speaking a rich manure it is far less so than good guanos. 



NITROGENOUS MANURES EMPLOYED. 



COUFRI. 



Two natural nitrogenous manures are largely used 

 in Egypt, viz : "Coufri" and "Tafla." While the 

 former is extensively employed both in Upper and 



