438 



INDEX 



in, 132; fertility of dry-farms, 284; 



wheats in, 240 ; present status 



of dry-farming in, 3S4, 3SG. 

 Oregon Station, dry-farming in, 370. 

 Organic matter, see Humus. 

 Osmosis, process of, 16S. 

 Oxygen, in air and carbon dioxid, 



172 ; in soil formation, 55 ; in 



germination, 207. 



Pacific, type of rainfall, 39. 



Packer, subsurface, 316. 



Pagnoul, 185. 



Palestine, present status of dry- 

 farming in, 397. 



Palouse Blue Stem wheat, 240. 



Palouse country, 3S5. 



Parsons, 252. 



Payne, 358, 367. 



Peach, dry-farm peach orchard in 

 Utah, 251. 



Peas, pounds water for one pound, 

 14, 15, 16; water absorbed by 

 seeds of, 209 ; repeated drying 

 in gerniination, 218 ; for nitrogen, 

 297 ; variations in composition, 

 268 ; field, 249. 



Pearl potatoes, 254. 



Phosphoric a^id, in soils, 69. 



Physical agencies, of soil formation, 

 52. 



Pine, on dry-farms, 253. 



Pinion pine, on dry-farm lands, 

 305. 



Plant, see also Crops; in soil for- 

 mation, 55 ; carbon in plants, 171 ; 

 proportions of plant parts, 258 ; 

 movement of water through 

 plant, 170 ; \'igor of plant and 

 transpiration, 179; effect of age 

 transpiration, 177. 



Plant-foods, enumeration of, 169 ; 

 total and available, 282 ; in arid 

 and humid soils, 67, 68 ; how 

 they enter plant, 168 ; move- 

 ment through plant, 170 ; effect 

 on transpiration, 177, 180. 



Planting, thick planting and evap- 

 oration, 151. 



Plow, for dry-farming, 305-309 ; 

 moldboard type, 306 ; disk type, 

 307; subsoiler, 309; need of better 

 knowledge for dry-farming, 309. 



Plowing, the dry-farm, 413 ; effect 

 on transpiration, 186 ; diminishes 

 evaporation, 138 ; as practiced in 

 various states, 195 ; deep and fall 

 plowing in all dry-farm districts, 

 194 ; depth of plo^dng in arid and 

 humid soils, 126; deep plowing 

 in arid soils, 62 ; deep plowing 

 defined, 126; deep plowing for 

 water storage, 125-126; reasons 

 for fall plowing, 127 ; fall plomng 

 for water storage, 126, 127 ; fall 

 plowing prevents evaporation, 

 127 ; fertility effects of fall plow- 

 ing, 127; time for fall plowing, 

 128; disking after fall plowing, 

 129; time for spring plomng, 

 128; in spring prevents evapo- 

 ration, 159 ; in spring of fall- 

 plowed land, 159 ; in spring after 

 fall plo-^ang, 129 ; disking fall- 

 plowed land in spring, 159 ; and 

 fallowing, 193 ; rough land 

 catches moisture, 128 ; to in- 

 crease pore-space, 102 ; to reduce 

 run-off, 98; wet soils, 101, 128; 

 disadvantages of steam plomng, 

 323. 



Plums, on dry-farm. 252, 253. 



Pod-bearing crops, 249. 



Poltava Station, 299, 370. 



Pore-space, of soils, 101 ; of gj'psum 

 soils, 102. 



Potash, in soils, 69. 



Potatoes, 254 ; depth of roots of, 

 88 ; mechanical planters, 320 ; 

 pounds water for one pound, 15 ; 

 variations in composition, 268 ; 

 water and yield, 346. 



Powell, Major J. W., on early dry- 

 farming, 355. 



