INDEX 



487 



Corn, time of irrigation, 185. 



protein in, 221. 



yield due to rainfall, 234. 



under irrigation, 255. 



cultivation of, 256. 



yield with varying water, 256. 



time to irrigate, 258. 



quantity of water for, 259. 



in humid climates, 410, 411. 



early yield, 457. 

 Cotton, early yield, 457. 

 Council Bluffs, 454. 

 Craigentinny, 415. 

 Cranberries, 326. 

 Crane, 410. 

 Crawley, 29. 

 Crop. See also Plant. 



development under irrigation, 158. 



time to irrigate short-season crops, 

 183. 



composition, 216. 



use of rainfall in production, 231. 



value of rainfall in irrigation, 233. 



tolerance of various, for alkali, 394. 



yields under early irrigation, 457. 

 Crowder, 428. 

 Cultivation. See also Mulching. 



saving water by, 40. 



against evaporation, 49. 



time, 53. 



depth, 55. 



frequency, 58. 



and soil fertility, 59. 



effect on water use, 121. 



in dry-farming, 237. 



of wheat, 243. 



of corn, 256. 



of alfalfa, 268. 



of sugar beets, 288. 



tools for, 440. 

 Cultivator, with shovel attachment, 



439. 



Cultural operations, effect on water- 

 cost, 141. 

 Currants, 326. 



in humid climates, 410. 

 Cusec defined, 332. 

 Cushman, 106. 



Dammer, 437. 

 Danube, 97. 

 Date, 314. 



under irrigation 328. 



alkali-resistant, 396. 

 Davis and Weber Counties Canal, 366, 



378. 

 Day irrigation, 187. 



Dead Sea, 83. 



Definition of irrigation, 4. 



Denver, 408. 



Desert, rainfall on, 1. 



Dewberries, sugar in, 225, 326. 



Distribution of water, 357. 



methods, 358, 361, 364. 



organization for, 365. 



cost of, 267. 



regulations and records, 368. 

 Ditch, concrete, 197. 



lined, against seepage, 376. 



locating, 420, 421. 



permanent, 196. 



typical farm, 425. 



making, 426. 



discharge of various, 432. 

 Ditch-tenders, for water distribution, 



367. 



Divisors, 350, 355. 

 Dole, 106. 

 Dorsey, 403. 

 Drainage-water, composition of, 78. 



loss of plant-food, 79. 



of wet lands, 381. 



remedy for alkali, 400. 

 Drill, in sowing wheat, 242. 

 Droughts, 407. 

 Dry-farming, 231. See also Rainfall. 



conditions of, 3. 



mission of, 7, 231. 



defined, 233. 



results of, 233. 



cultivation, 237. 



relation to irrigation, 237. 



homesteads for, 238. 



mission of, 239. 



Congress, 239. 



orchard experience, 324. 

 Dry-matter. See also Water-Cost. 



water-cost of, 127. 

 Duty of water for 



wheat, 248, 252, 253. 



oats, 253. 



barley, 255. 



rye, 255. 



corn, 259. 



rice, 263. 



alfalfa, 274. 



hay crops, 278. 



clover, 281. 



pastures and meadows, 281. 



sugar beets, 293. 



carrots, 297. 



potatoes, 299. 



peas and beans, 301. 



fiber crops, 305. 



