Bui. 53, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



PLATE XVII. 



FIQ. 1. DATE PLANTATION ON ALKALINE SOIL AT OURLANA, ALGERIA. 



FIG. 2. CRESCENT-SHAPED EXCAVATION AT THE BASE OF A DATE PALM TO HOLD 

 IRRIGATION WATER, BISKRA, ALGERIA. 



