Relation of: 



alkali to biological conditions, 

 132 



alkali to physical conditions, 

 119 

 Removing salts from surface, 159 

 Resistance: 



factors affecting, 192 



tables, 96 

 Resistant crops in reclamation, 162 

 Reviel, 59 



Rhodesia, alkali in, 10 

 Rice, 214 



experiment with, 114 

 Robinson, J. S., 130, 131, 151, 158, 



166 

 Rock, composition of, 16 

 Rolet, A., 160, 166 

 Root: 



crops, 215 



zone increased by drainage, 169 

 Roots injured by alkali, 34 

 Rushes, 208 



Rush, as alkali indicator, 64 

 Russian olive, 221 

 Rye, 214 



grass, 204 



Sachsse, R., 120, 131 



Sackett, W. G., 30, 33, 140 



Sage brush as indicator of land, 242 



Sahara, soils of, 10 



Saline lakes, 27 



Salt: 



bushes, 207 



bush as alkali indicator, 63, 70 



crust, relation to evaporation, 



157 

 grass, 205 

 grass, as alkali indicator, 63, 73, 



movement with water, 142 



INDEX 



Salt: 



255 



River water, 225 



wort, as alkali indicator, 63. 



Salts: 



absorption by soils, 109 

 antagonism between, 113 

 by bridge method, 94 

 by freezing-point method, 102 

 effected by calcium, copper, 



zinc, 116 

 effect of, on moisture move- 

 ment, 128 

 from ancient seas, 22 

 in hardpan, 127 

 in natural soil, 141 

 movement of, 14, 146 

 plowing under of, 158 

 quantity to reduce yields, 56 

 removal from surface, 159 

 removed in drainage, 163, 164 

 soluble in water, 105 

 solubility of, 106 



Samphire, as alkali indicator, 63 



Sanchez, A. M., 198, 222 



Sand, experiments in, 49 



Sandsten, E. P., 166 



Sandstone, composition of, 16, 18 



Saskatchewan, alkali in, 7 



San Joaquin Valley, alkali in, 8 



Schreincr, O., 82, 104 



Scofield, C. S., 239 



Sedger, 208 



Seed germination experiments, 44 



Shading to reduce evaporation, 157, 



158 



Shadscale, as alkali indicator, 63, 70 

 Shale, composition of, 16, 17 

 Shantz, H. L., 80 

 Sharp, L. T., 115, 118, 131, 137, 148, 



149, 153 

 Shaw, G. W., 15 

 Shinn, C. H., 152, 160, 166 

 Shooting star, as alkali indicator, 64 



