INDEX 



303 



PAGE PAGE 



Potash, muriate 237 Tankage 232 



office of 228 Temperature helps soil-making. . 10 



sources of 236 Texture improved by lime 102 



sulphate 237 improving 93 



where secured..' 45 may be modified 35 



Potassium, function of 228 Thome's manure experiments 



Plant composition 45 225, 263 



food, available 67, 69 Tiles, advantages of 161 



food supply large 87 the perfect drain 161 



food, unavailable 69 Tillage benefits 92 



Plants assist soil-making 19 checks denitrification 124 



demands upon plant food 79 destroys weeds 97 



exhaust soil 271 effect of 91, 92 



in soil-making 17 jncreases moisture 96 



prefer certain soils 24 increases plant food 94 



prehistoric 18 natural 88 



Plow, disk 191 practising 284 



gang 191 Tobacco soil analysis 27 



one-horse 189 Tools, interculture 198 



work it should do 186 preparation 192 



ancient and modern 185 Transpiration 164 



various 189 Truck soil analysis 27 



Plowing, poor, example 188 Tubercles, root 114, 137 



Pore-spaces in soil 37 Tull, J 90 



Production related to soil texture 87 quoted 203 



Protoplasm defined 50 Types of soil 26 



Roberts' manure experiments... 223 of soil, secondary 30 



Roller, function of 93 Ville 114 



Root, method of growth 41 Voelcher 113 



wastes 275 Water, capillary 40 



depth of 86 capacity to hold 42 



in soil-making 21 conserving 205 



secure food 45 films 37, 38 



Root-hairs, action 47 gravitational 40 



function of 46 helps soil-making 12 



Rotation, destroy weeds 274 holding capacity of soils 42 



example for 50 years 82 holding increased 96 



examples of 280 hygroscopic 40 



for different fields 276 increased 196 



manure in 277 increased by compaction 196 



on worn land 289 in soils, kinds of 40 



with mixed farming 279 in soil-making 10, 12, 14 



Running out of soils, the cause of 85 lifts plant food 41 



Saltpeter 23 1 passes through soil 38 



Sandy soils modified 35 saved by leaves withering 50 



Sap flow 47 saved by tillage 167, 172 



Shells 10 1 saving 184 



Silicon defined 56 saving means early work 204 



function of 57 sorts soils 14 



Size of soil particles 24 three kinds in soil 40 



Snyder's manure experiments. . . 225 used up by weeds IQQ 



Soda, nitrate 230 Weeds affect water content.... 199 



Sodium defined 60 Wheat, analyses of plant food 



function of 60 80, 81 



Sourness in soils 104 and dairying compared 257 



Spreader, manure 220 continuously grown 261 



Stables 2:3 lands 28 



Stock, feed crops to 298 soil analyses 27 



injures soil 286 Wilfarth IOQ, 1 14, 139 



Stubble, managing 179 Wind helps soil-making 15 



Subsoil defined 4 Woll on dairying 255 



differs from surface 76 Work, eliminate hand 297 



plant food from 86 Worn-out soils not exhausted.. 87 



Sulphur defined 57 Worms help soil-making 21 



f ninth. ii of 57 Yeast action 144 



Symbiosis defined 140 Ycddes, quoted *77 



