INDEX 
Aaronsohn, 252, 253. 
Absorption, explained, 166-170; 
selective, 170; of water by seeds, 
210. 
Africa, present status of dry-farm- 
ing in, 393. 
Air, see also Sotl-air; composi- 
tion, 172, 209; moisture in, 46, 
103, 133, 134. 
Alberta, deep and fall plowing in, 
195; fallowing in, 197. 
Alcohol, engines for pumping, 342. 
Alfalfa, see Lucern. 
Algeria, durum wheat in, 237. 
Alkali, furthers evaporation, 149; 
soils, 66; and native vegetation, 
80; effect on absorption, 168. 
Alumina, in soils, 70. 
Alway, 95; on Saskatchewan, 407. 
Alway and Trumbull, 285. 
American Indian, dry-farmers, 353. 
Antiquity, great nations of antiquity 
in arid countries, 351. 
Apples, on dry-farm, 252. 
Area, dry-farm areas, 22, 27; 
farm for one man, 301. 
Arid, defined, 24. 
“ Arid-farming,”’ 4. 
Arid region, defined by evapora- 
tion, 131. 
Aridity, civilization and, 
determined by rainfall, 25. 
Arizona, area, 26; type of rainfall, 
89; soils, 76; evaporation in, 
132; pumping in, 344; eco- 
nomical use of water, 348; mes- 
quite tree, 251, 305; olive or- 
chards, 252; milo, 246; cacti, 
305; present status of dry-farm- 
ing, 388. 
dry- 
351; 
Arizona Station, dry-farming, 369. 
Ash, in plants, 264, 281. , 
Assimilation, of carbon, 171. 
Atkinson, 120, 190, 202. 
Atmosphere, see air. 
Auger, for judging soils, 78. 
Aughey, 90. 
Australia, dry-farm area, 33; fal- 
lowing in, 197; present status 
of dry-farming, 393. 
Azotobacter, in dry-farming, 291. 
Bacteria, and lime, 70; and soil- 
fertility, 290. 
Batley, 74. 
Ball, 245. 
Barley, 241; pounds water for one 
pound, 14, 15; depth of roots, 
88; amount to sow, 224; water 
absorbed by seeds of, 209; 
repeated drying in germination, 
218; variations in composition, 
271. 
Barnes Farm, record of, 403. 
Basis, theoretical basis of dry-farm- 
ing, 11. 
Bean, field, 250; for nitrogen, 297; 
water absorbed by seeds of the, 
209. : 
Bear River City, first large dry- 
farming trial at, 355. 
Bibliography, of dry-farming, 417-— 
424. ; 
Black walnut, on dry-farms, 253. 
Blowing, of soils in Great Plains, 
198. 
Blue Stem wheat, 237, 240. 
Bogdanoff, 210. 
Bonneville, Lake, 75, 386. 
Boswell oats, 241. : 
429 
