232 



ALKALI WATER FOR IRRIGATION 



TABLE XXII. ANALYSES OF SOME CHARACTERISTIC ALKALINE 

 RIVER AND LAKE WATERS or WESTERN UNITED STATES 



(a) 47. 9 %NaCl. 



(b) 16.1% Na 2 CO 3 , 69.0% NaCl, Na 2 SO 4 , etc., 7.1% CaCO 3 , MgCO 3 

 and silica. 



No analyses of well waters used for irrigation are pre- 

 sented because well waters have been found to vary so 

 greatly even in short distances that each well must be 

 tested separately. There are certain large artesian basins 



