INDEX 



521 



PAGE 



Ice-formed soils, character of . . . . 54 



Igneous rocks 11, 12 



Implements for creating mulch . .207 



Implements of tillage, group 469 



Implements used to increase water 



capacity 217 



Inoculation, part in soil manage- 

 ment 465 



Of soil by means of cultures. . . .428 



Of soil for legumes 425, 427 



Inorganic constituents of soil .... 69 



Insects, effect on the soil 390 



Relation to crop rotation 508 



Insolubility of the soil 267 



Inspection of fertilizers 344 



Iron as coloring material 101 



As plant food element 3 



Oxides as cementing material . . 100 

 Irrigation, amount of water to 



use 226, 235 



Conditions requiring 221 



Duty of water in 222 



Effect of on alkali 236 



Effect on soil air 447 



Engineering and agricultural 



phases 222 



Evaporation affects practice. . .197 



Kind of soil most suited to 237 



Land in United States requir- 

 ing 223 



Of tobacco in Florida 237 



Part of soil management 465 



Relation of climate to practice 



of 224 



Relation of tillage to practice. .225 



Relation to alkali 314 



Skill required in 228 



Time to apply water in 224 



Units for measuring water in . . . 227 

 When to apply water 197 



Jointer, for plow, use of 476 



Kainit 3 



Kaolinite, character of 7 



King, amount of water moved by 



soils 186 



Effect of drainage on soil tem- 

 perature 244 



Effect of plow on soil structure. Ill 

 Effect of trees on evaporation. .214 

 Experience with dust mulch. . .207 

 Experiment in spring plowing. .211 



PAGE 



King, extent of soil moisture ad- 

 justment 184 



Figures on effect of drainage on 



temperature 463 



Figures on effect of subsoiling. .219 



Figures on percolation 166 



Observations on action of plow. 469 



On temperature of soil 459 



Skill required in irrigation 228 



Small rainfall increases loss of 



soil water 198 



Suggestions on structure 103 



Water used by plants 134 



Kunze, experiments on solvent 

 action of roots 289 



Lake or lacustrine soils 47 



Land in United States requiring 



irrigation 223 



Lang, figures on specific heat of 



soil 456 



Late soil, causes of 462 



Relation of drainage to 243 



Lawes and Gilbert, water used by 



plants 134 



Leaching of manure 377 



Organic matter 127 



Leaf mold 121 



Legumes, bacteria on roots 423 



Leguminous crops for green ma- 

 nure 385 



Absorption of nutrients 296 



Legumes, inoculation of soil for. . .427 

 Legumes, inoculation of soil for. . .425 



Levees used in drainage 263 



Level culture, generally best 216 



Lime, carbonate effect on soil. . . .352 



As cementing material 100 



Lime, caustic effect on soil 352 



Effect on humus 127 



Effect on plant diseases 350 



Effect on soil bacteria 348 



Effect on structure 116 



Effect on tilth 348 



Effect on toxic substances 350 



Forms of, in relation to structure 117 

 Ground limestone, effect on soil .353 



Liberation of plant food 349 



Lime-nitrogen 330 



Lime, relation to magnesium 350 



As a soil amendment 348 



Limestone soils 37 



Lister, conditions where useful. . . .485 



