INDEX 



527 



PAGE 



Sediment, in water of chief rivers . . 26 



Seeder types of cultivators 485 



Selective absorption of nutrient 



salts 286 



Semi-arid soils, composition of ... . 65 



Separate grain structure 89 



Separates, properties of soil 80 



Series, soil, defined 78 



Sewage irrigation 2L>2 



Shale soils 39 



Shapes of soil particles 70 



Sheep manure 371 



Silica as cementing material 101 



Silting up of tile drains 258 



Silvinit 341 



Size of particle, influence on soil 



absorption 299 



Slime molds 394 



Slope of soil, influence on tempera- 

 ture 458 



Shrinkage of soil 9S 



Sod, effect on nitrification 417 



Sodium nitrate 324 



Sodium nitrate, composition of. . .325 



Deflocculating action 325 



Effect on structure 118 



Effect on plant growth 325 



Preparation 325 



"Soil" defined 68 



Adaptation to crops 497 



Air 432 



Amendments 348 



Analysis, influence of absorp- 

 tion 277 



Broader than geology 2 



Characteristics of 2 



Clay 74 



Cohesiveness 98 



Environment of plant 1 



Factors in plant growth 1 



Forming rocks, important 9 



Functions of 1 



Management and texture 80 



Mechanism 2 



Moisture, adjustment of 170 



Number of particles in classes. . 82 



Organic constituent 119 



Organic matter in 125 



Organisms 3S8 



Particles, constitution of 69 



Particles, influence surface cool- 

 ing on movement of moisture . 183 

 Particles, relation to root-hairs . 287 



PAGE 



Soil, plasticity 98 



Productiveness in relation to 



crop rotation 503 



Productiveness of arid and humid 69 

 Requirements of growth fur- 

 nished by 501 



Sandy 74 



Separates, composition of 84 



Series, defined 78 



Structure, defined 88 



Study, viewpoint 2 



Surface area of 83 



Types 78 



Units 80 



Solar radiation, relation to soil 



temperature 451 



Soluble material in water of chief 



rivers 24 



Solubility of the soil 267 



Solubility of the soil, surface ex- 

 posed 267 



Composition of particles 267 



Organic matter 127 



Relation to texture 270 



Strength of solvent agents 267 



Soluble salts, affect flocculation. . . 116 

 Soluble salts.as cementing materiallOO 



Effect on structure 116 



Solution, affect movement of waterl73 



By water in rock decay 22 



Surface tensions 173 



Sorting power of water 27 



Source of soil material 2 



Specific gravity of soil, absolute. . 94 



Of humus 128 



Table of apparent 96 



Specific heat of soil and water. . . .455 

 Spray irrigation, advantages and 



disadvantages of 233 



Spray irrigation, conditions where 



used 232 



Spring plowing 210 



Starch, decomposition by bacteria .405 



Stassfurt salts 340 



Steamed bone 335 



Stewart, figures on capillary move- 

 ment 18J 



Effect of cloth shade on soil 



moisture 214 



Rainfall causes loss of soil water 198 

 Storer, quotes Detmers, water 



capacity 153 



Reports soil moisture for crops . . 155 



