INDEX 



437 



Tillage after irrigation essential, 270 

 benefits of, 97, 105, 112 

 deep, increases water capacity 



of soils, 83 

 good, value of, 36 

 influence on soil temperature, 



36 



present emphasis on, 97 

 promotes fertility, 110 

 to kill weeds, 101 

 to prepare seed bed, 98 



Tomatoes, temperature of soil for, 32 



Tools, a variety needed, 186 

 extravagance in, 186] 

 farm, selection of, 185 

 hand, 183 



Transported soils, 47 



Tree seeds, 290 



Trees an aid to drainage, 78 



hardwood preferable, 290 

 how to transplant, 290 

 quick-growing, to check 

 erosion, 290 



Tree roots obstruct drains, 228 



seedlings, how to set out, 291 



Under-drainage, philosophy of, 205 



cost of, 229 



to lower water-table, 83 



benefits of, 192 



deepens shallow soils, 192 



for clayey soils, 192 

 Under-drains, action of, 205 



cost of laying, 228 



depth of, 219, 220 



distance between, 218 



kinds of tiles for, 221 



to estimate size of, 223 

 Underground streams, 85, 243 

 Unproductive soils have been mis- 

 managed, 344 

 Utah, rotation in, 415 



Value of testing soils, 73 

 Ventilation of the soil, 37, 111 

 Vermont, rotation in, 416 

 Vetches, smooth and hairy, soil im- 

 provers, 341 

 Virginia, rotation in, 416 



Washington, rotation in, 416 

 Water absorbed from ah-, 31 



amount needed by plants, 

 76,264 



Water, amount required to produce 



crops, 238 

 capacity of soils to hold, 80 



93 



contents of soil, 29 

 distribution for irrigation, 250 

 ditches and flumes, 251 

 duty of, 264 

 film, 30 



amount held by soils, 



81 



movement of, 87 

 to prevent loss of, 90 

 for irrigation, sources of, 244 

 free, to remove excess, 204 

 held in the soil, 29 

 irrigation, best way to use, 254 

 by flooding, 254 

 by furrows, 257 

 contour check system, 



255 



filling the checks, 255 

 how to apply, 253 

 on slopes, 255 



wild flooding, 256 

 loss by evaporation, 88, 93 

 loss by seepage, 84 

 measurement, acre inch, 263 

 for irrigation, 262 

 how to regulate, 262 

 miner's inch, 263 

 modules, 263 



moving, action on soil, 15 

 pipes, 252 



required for arid soils, 265 

 right, cost of, 

 soil, cultivation to save, 163 



maintenance of, 75 

 supply, influence of forests 



on, 84 



units in measuring, 263 

 Water-built soils, 17 

 Water-moving ability of soils, 92 

 Water-moving ability of soils, test 



of, 95 

 Water-table, 29 



height of, 82 



Water-wheels, as pumps, 249 

 Weathering of rocks, 3, 5 

 Weeders, types and use of, 156 

 Weeds, best time to kill, 159 

 cultivating to kill, 157 

 Weeds, definition, 101 



discourage laziness, 103 



