518 



INDEX 



PAGE 



Drainage, conditions requiring .. .238 



Depth of underdrains 254 



Effects of on soil 239 



Frequency of underdrains 254 



Late soils 243 



Methods of 248 



Part of soil management 465 



Principles of 248 



Relation to absorption 302 



Soil temperature 463 



Special types of 263 



See Underdrains. 



Drainage water, composition 303 



Records at Rothamsted 303 



Dried blood 333 



Dried meat 334 



Dry and damp soil, capillary move- 

 ment in 180 



Dry farming, place of mulch in . . 208 



Use of manure in 383 



Drv matter, water used in produc- 

 tion 134 



Dry soil, capillary movement in. .176 

 Drying of soil, influence on struc- 

 ture 107 



Relation to checking 106 



Dust, blankets 203 



Mulch, management of 205 



Storms 17 



Soil, composition of 63 



Volcanic 62 



Duty of water in irrigation 222 



Duty of water in irrigation, factors 



affecting 224 



Early soils, causes of 462 



Earthworms, effect on structure. . 118 

 Effects of organic matter on soil. . 129 

 Efficiency, maximum capillary. . .172 



Elements, abundance of 4 



Of plant food 3 



Proportion lost in residual soil 



formation 34, 36 



Engineering in irrigation 222 



Erosion, agencies causing 492 



By water, conditions permitting 494 



Control of 494 



Relation of drainage to 247 



Evaporation 164 



Evaporation, affected by checking 99 



Affected by winds 213 



At Rothamsted 196 



Effect of on soil temperature. . .461 



PAGE 



Evaporation, from weeds and green 



manure 195 



From soil, wastes water 195 



Occurs at surface 196 



Prevented by 199 



Prevented by special treatment . 213 

 Proportion of rainfall lost in 



United States 196 



Relation to irrigation 197 



Relation to mulch formation . . . 198 



Ridge culture to prevent 216 



Excreta, solid of manure 364 



Exhaustion of mineral nutrients. .285 



Exhaustion of nitrogen 328 



Exhaustion of plant food 285 



Expansion, of minerals and rock 



by heat 19, 20 



Soil due to water 162 



j Factors in plant growth 1 



Factors which determine soil tem- 

 perature 453 



Failyer table, composition of soil 



separates 86 



Fall plowing 210 



Farm manures 363 



Fermentations of manure 375 



Ferric hydrate, effect on absorp- 

 tion 300 



Fertility of land, relation to irri- 

 gation 225 



Fertilizer, brands 343 



Ammonium sulfate 326 



Availability of phosphates 339 



Basic slag 337 



Bone phosphate 335 



Bone tankage 335 



Calcium cyanamid 328 



Calcium nit rate 33 1 



Commercial 322 



Computation of value 345 



Constituents 324 



Containing phosphorus 334 



Cumulative need for 363 



Double superphosphates 339 



Dried blood 333 



Dried meat 334 



Effect of soil acidity on availa- 

 bility ...359 



Effect of soil moisture on availa- 

 bility 358 



Factors affecting efficiency 355 



Function 322 



