INDEX 
meat in oats from, 261; present 
status of dry-farming, 385, 389; 
fourth, Dry-farming Congress in 
Billings, 377. 
Montana Station, dry-farm work 
begun, 369; on fallowing, 202; 
water stored in soil, 120. 
Mormon, pioneers began reclama- 
tion of West, 365. 
Morton, J. S., Secretary of . Agri- 
culture, 372. 
Motherwell, record of dry-farm, 410. 
Mulch, see also Cultivation; value 
in reducing evaporation, 155; 
explanation. of effect of mulch, 
152; natural mulch in arid -cli- 
mates, 149; ‘on different soils, 
149; effect of varying depth of, 
158; implements for making a 
soil, 310. 
Natural precipitation, see Rainfall. 
Nebraska, area, 26; type of rainfall 
over, 41; soils of, 74; deep and 
fall plowing in, 195; fallowing 
in, 197; storing the rains in the 
soil, 115; water stored in soils 
of, 122; wheats for, 236; milo 
in, 246; present status of dry- 
farming, 389. 
Nessler, 139, 154. 
Nevada, area, 26; type of rainfall 
over, 39; soils of, 75; evapora- 
tion in, 132; fallqwing in, 196; 
present status of dry-farming in, 
386. 
-Nevada Station, dry-farming in, 
369. 
Newell, 32. 
New Mexico, area, 26; type of 
rainfall over, 39; soils of, 74, 76; 
evaporation in, 132; fallowing in, 
197; experiments on pumping, 
343; mesquite and cacti on dry- 
farm lands, 305; milo in, 245; 
present status of dry-farming in, 
388, 390. 
437 
Nitrates, and transpiration, 190; 
effect on germination, 210. 
Nitrogen, in arid humus, 59, 71; 
critical element of soil fertility, 
292; explanation of accumula- 
tion of, 292; from leguminous 
crops, 296; from lucern, 249. 
Nobbe, 84, 85. 
Norris, Governor, president Dry- 
farming Congress, 377. ; 
North Dakota, area, 26; fallowing 
in, 197; meat in oats from, 261; 
present status of dry-farming in, 
389. : 
North Dakota Station, dry-farming 
in, 370. 
Nowoczek, 217. 
Nutrients, see Plant-foods; in crops, 
264. 
Oak, on dry-farm, 253. 
Oats, 241; pounds water for one 
pound, 14, 15; depth of roots, 
88; water absorbed by seeds of, 
209; repeated drying in germina- 
tion, 218; amount to sow, 224; 
meat in oats, 261; in rotations, 
299; variation in composition, 
268, 269. 
Odessa Station, 370. 
Office of Dry Land Investigations, 
ara. 
Ohio potatoes, 254. 
Oil, crude oil engines for pumping, 
- 842, 
Oklahoma, area, 27; type of rain- 
fall over, 40; soils of, 74; milo 
in, 245; present status of dry- 
farming in, 390. 
Olin, 357. 
Olive, dry-farm olive orchards in 
United States, 252; industry in 
Tunis, 252; trees in Tunis in 
early days, 353; tax-of oil from 
Tunis, 353. 
Oregon, area, 26; type of rainfall 
in, 39; soils of, 75; evaporation 
