INDEX 



529 



PAGE 



Temperature of soil, heat from in- 

 terior of earth 452 



Influence of drainage on 242 



Influence of organic decay 452 



Influence of shelter on 464 



Influence of slope on 458 



Means of modifying 463 



Relation to bacteria 400 



Relation to physical processes. .451 



Relat ion to specific heat 455 



Relation to sunshine 453 



Sources of heat for 451 



Tensile strength and plasticity ... 97 



Tent of cloth, effect on soil moist- 

 ure 214 



Texture, defined 70 



And moisture capacity 80 



And soil management 80 



Classification 70 



Classification, agricultural 74 



Determines structure 92 



Effect on capillary movement. .176 



Effect on heat conductivity 459 



Effect on percolation 167 



Groups, limits in size 73 



Importance in mulch 205 



In relation to soil air 432 



Modification of 87 



Relation to absorption 103 



Relation to capillary water 144 



Relation to composition 87 



Relation to crops 79 



Relation to gravitational water. 161 

 Relation to hygroscopic water. . 144 

 Relation to movement of moist- 

 ure 172 



Relation to pore space 93 



Relation to solubility 270 



Relation to shrinkage 98 



Relation to surface area 83 



Soil, relation to type of plow. . .470 



Thermal movement of soil moisture 189 



Tile drains. See Underdraws. 



Tillage, objects of 467 



Action of implements in 469 



And granulation Ill 



As means of drainage 263 



By cultivators 478 



By plows 469 



Early and late to kill weeds. . . .491 



Effects on the soil 468 



Effect on volume and movement 

 of soil air 444 



PAGE 



Tillage, implements of 468 



Influence on structure Ill 



In grain fields 209 



In spring, effect on soil tempera- 

 ture 461 



Nature's method 18 



Part of soil management 465 



Practice, best for holding water. 217 



Principles of 466 



Relation to alkali control 236 



Relation to irrigation practice. .225 

 Relations to structure and water 



movement 182 



Rollers, packers and crushers for 486 

 Time elements in capillary move- 

 ment 180 



Element in movement of soil 



moisture 173 



To apply irrigation water 224 



Tobacco, irrigation of in Florida. .237 

 Toxic substances, effect of lime on . 350 



Relation to crop rotation 509 



Trade value of fertilizers 344 



Transported soils 30 



Transported soils, agencies of . . . . 44 

 Transporting power of flowing 



water 24 



Tubercles 423 



Types, soil 78 



Underdrains, arrangement on hill 



land 262 



Construction of 251 



Depth of 252 



Effect on soil air 445 



Freezing of 261 



Frequency of 254 



Grade of 258, 263 



Importance of outlet 261 



Materials used in construction. .251 

 Plants roots enter, when . . . 253, 261 



Silting up of 258 



Size of 255 



Systems of arrangement 254 



Types of tile used in 258 



Units of soil, defined 80 



Units, used in measuring irrigation 



water 227 



Use of lime on soils 348 



Urine in manures 366 



Vegetables, absorption of nutrients 296 

 View point, of soil study 2 



HH 



