432 



INDEX 



162; early in spring, 159, 160; 

 during season, 160 ; depth of, 

 157; must destroy weeds, 162; 

 of growing crops, 163 ; of rows 

 of lucern, 248 ; of fall-sown crop 

 in spring, 159 ; between rows 

 of plants, 163 ; implements for 

 soil cultivation, 310. 



Cultivators, 314. 



Currants, on dry-farms, 253. 



Dakoias, soils of, 74 ; type of rain- 

 fall over, 40 ; wheats for, 236 ; 

 milo in, 246. 



Davidson and Chase, 307. 



Defiance wheat, 240. 



Desert, essentially fertile, 58, 72, 73. 



Disk harrow, 311, 313. 



Disking, 414; after harvester, 127; 

 after fall plowing, 129 ; fall- 

 plowed land in spring, 129, 150; 

 to reduce run-off, 98 ; crop in fall, 

 226 ; crop in spring, 227. 



Dog Valley, state well in, 341. 



Drainage, plant food in drainage 

 water, 65 ; in arid countries, 66. 



Drill, invented by Tull, 226, 317; 

 types for sowing, 318. 



Drill culture, 225; and snow con- 

 servations, 225. 



Drouth, de6ned, 49, 400, 402, 412; 

 how to farm against, 416 ; year 

 of drouth, 399; year of drouth 

 disproved, 403-412; fallow in- 

 dispensable in year of, 203 ; of 

 1910,411. 



Dry-fanning, defined, 1 ; a mis- 

 nomer, 2; a technical term, 4; 

 vs. humid-farming, 4 ; fun- 

 damental problems, 6, 9 ; theo- 

 retical basis of, 11 ; climatic 

 features of areas, 35 ; physical 

 features of territory in United 

 States, 35 ; areas in United 

 States, 25-32 ; areas in world, 

 32-34 ; soils, 50-80 ; three main 

 conditions, 192 ; water the crit- 



ical element in, 203 ; and ma- 

 chinery, 302, 327 ; crops for, 232 ; 

 certainty of crop yield, 204 ; 

 importance of steady productive 

 power, 293; and irrigation go hand 

 in hand, 350; total area in 

 United States, 27 ; originated 

 in several places, 193 ; system 

 same in divers localities, 194 ; 

 in a nutshell, 413. 



Dry-farm, size of a dry-farm, 301. 



Dry-farmer, temperamental char- 

 acteristics, 330 ; acreage for one 

 man, 301. 



Dry-farming Congress, organization 

 and history, 374 ; opinions on 

 cultural methods, 194. 



" Dry-land agriculture,'' 4. 



Dry matter, and transpiration, 182- 

 186; methods for determining 

 water for, 12 ; water for one 

 pound of, 12 ; water cost in 

 arid countries, 17. 



Durra, 245. 



Durum wheat, 237. 



Ehcrmayer, 150, 155. 



Egypt, sands of Egypt fertile, 58. 



Electricity, electric motors, 322, 325 ; 

 for pumping, 342. 



Elm, on dry-farms, 253. 



Emmer, 243. 



Engines, in dry-farming, 321. 



England, Bo.swell oats from, 241 ; 

 steam plowing in, 323. 



Escobar, 244. 



Eser, 148. 



Europe, steam plowing in, 323. 



Evaporation, formation of water 

 vapor, 132 ; factors increasing, 

 133, 136 ; effect of temperature 

 on water vapor, 133 ; from free 

 water surface, 132 ; and relative 

 humidity, 46 ; measure of arid- 

 ity, 131 ; under humid and arid 

 conditions, 149 ; possible evap- 

 oration in arid districts, 131 ; 



