INDEX 



441 



Value of increase for manure per 



crop and ton, 168 

 organic matter to soils, 148 



binds soil particles to- 

 gether, 151 

 biological effects, 150 

 erosion, loss by, pre- 

 vented, 150 



furnishes nitrogen, 151 

 granulation affected, 148 

 moisture retained, 149 

 puddling prevented, 150 

 temperature raised, 150 

 Van Slyke, L. L., per cent of liquid 



and solid excrement, 162 

 composition of fresh manure, 



163 



Vegetation, aid in filling gullies, 374 

 factor in soil classification, 75 

 source of soil organic matter, 



144 



Vegetative covering, effect on ero- 

 sion, 350 



Velocity of current, effect of, on 

 size of material carried, 

 33 



on work of streams, 16 

 Ventilation of .soils, 311 

 Vertical cleavage or wall, character- 

 istic of deep loess, 63 

 Viscosity of water, 187 



affecting capillary movement, 



204 



effect of, on percolation, 210 

 Volcanic dust, 6 

 rocks, 6 



Wandering sand dunes, 54, 58 

 Water, amount of, to apply in irri- 

 gation, 363 



re< |tiircd by plants, 187 

 at different heights above water 



table, drained, 217 

 available, 213, 214 

 capacity of soils, maximum, 200 

 capillary rise of, affected by 



temperature, 204 

 in glass tubes, 199 

 use of, 212 

 comparison Iwtween computed 



and observed flow of, 129 

 draining from eight feet of satu- 

 rated sand. 221 

 duty of, 267, 268 



Water evaporated daily per square 



foot of soil, 210 

 evaporation of, effect on soil 



temperature, 296, 300 

 for irrigation, character of, 261 

 gravitational, chapter on, 217 

 height and apidity of capillary 



rise in different soils, 207 

 in soil in one-foot strata to 8 



feet deep, 248 

 irrigation in varied quantities, 



yield of dry matter, 264 

 -laid soils, 33 



liquid, effect on soil tempera- 

 ture, 205 

 -logged soil prevents aeration, 



313 



loss of, by interstitial evapora- 

 tion, slight, 233 

 from canals, 266 

 in dry farming by evapora- 

 tion, 243 



by percolation, 242 

 by run-off, 242 

 by transpiration, 244 

 methods of preventing, 244 

 deep tillage, 245 

 fall plowing, 246 

 storing rainfall, 247 

 subsurface packing, 247 

 summer tillage, 246 

 material carried by, 33 

 measurement and distribution 



of, in irrigation, 268 

 moved by capillarity, amount 



of, 210* 

 of soils, chapter on, 186 



capillary, chapter on, 199 

 physical characteristics, 186 

 presence of, effect on soil tem- 

 perature, 302 

 producing power of, in varied 



application. 265 

 removal of excess of, 222 

 factor in aeration. 311 

 required for corn, Utah. 242 

 to produce one pound dry i 



matter, 242 



requirement of plants, 241 

 river, suspended matter in. 2f>2 

 table, topography of, in tiled 



land, 228 

 transpired, for one part of dry 



matter produced, 188 

 uses of, enumerated, 187 



