300 



i i i i i i .i i i J I I 



Fig. 



500 - 



400 



300 



200 



too h 

 f ^ 



"\ I I ' I i i I I I I I I L_ 



10 IS 



1. Manured ivith Phosphate <? Potash in addition to Nitrogen. 



2. Nitrogenous manure alone. 



1. Fume auec a/u .phosphate & engrain potassioue en plus dn I'tngrais arote 



2. Enyrais arote jeuif.rne.nt. 



&& ' 5 



by the Survey Dept. Egypt, 1916. (66. A) 



