INDEX 



517 



PAGE 



Computation of value of fertiliz- 

 ers 345 



Conditions affecting growth of 



bacteria 399 



Conditions affecting structure . . . .103 

 Conditions requiring irrigation . . . .221 



Conductivity of heat by soil 459 



Conduction of heat, effect on tem- 

 perature 452 



Constituents of soil 69 



Constituents of soil, organic 119 



Control of erosion 494 



Control of soil moisture, means 



of 155, 191 



Coulters, for plow, use of 476 



Covered drains. See Underdrains. 



Cow manure 369 



Crop adaptation, examples of . . . .503 



And texture 80 



Factors in 499 



Lack of knowledge 501 



Part in soil management 465 



Philosophy of 497 



Crop, peculiarities of, in water re- 

 quirement 224 



Crop rotations 503 



Crop rotation, effect on soil struc- 

 ture 506 



Nutrients renewed by 504 



Place of manure in 383 



Principles of 504 



Relation to diseases and insects. 508 

 Relation to loss of plant food. . .509 

 Relation to toxic substances .... 509 



Relation to weed growth 508 



Root systems of different crops .505 

 Some crops prepare food for 



others 505 



Crop value reduced by shrinkage. 98 

 Crop yields, effect of drainage on . . 247 

 Crop yields often controlled by soil 



moisture 197 



Cropping in alternate years 196 



Cropping, effect on soil air 447 



Crops, absorptive power, for nutri- 

 ents 291 



Relation of to use of irrigation 



water 235 



Relation to texture 79 



Crumb structure 91 



Cultivation, best time for 478 



Cultivators, types of 478 



Effect on soil 478 



PAGE 



Cultivators, harvester type 486 



Seeder types 484 



Cultures for soil inoculation 428 



Cumulose soils, characteristics of. 41 



Composition of 44 



Occurrence of 41 



Czapek, experiments on solvent 



action of roots 288 



Dead furrow, meaning of 475 



Decay, agencies of rock 14 



Types of 14 



Decay of organic matter 120 



Promoted by 132 



Retarded by 132 



Rock, type of and composition 



of soil 36 



Decay, place of bacteria in 408 



Decomposition, type of rock decay 14 

 Decreasing moisture content of 



soil 238 



Damp and dry soil, capillary 



movement 180 



Deep plowing, advantages of .218, 221 

 Deficiency of mineral nutrients. . .280 



Deficiency of plant nutrients 273 



Deflocculation, effect of sodium 



nitrate 325 



Denitrification 420 



DeRossi, experiments with Pseu- 



domonas radicicola 427 



Depth best for mulches 207 



Depth to which nitrification ex- 

 tends 418 



Deterioration of farm manure 375 



Detmer, effect of humus on sand, 



water capacity 153 



Diameter of individual pores. ... 94 



Dicyanamid 330 



Diffusion of moisture vapor in soil . 189 



Diffusion of soil air 439 



Disc harrows and cultivators 482 



Disc plows, efficiency of 476 



Diseases of plants, relation to crop 



rotation 508 



Disintegration, by atmospheric 



agency 18 



Type of rock decay 14 



Distribution of bacteria 396 



D'Orbigny, abundance of minerals 8 



Double superphosphates 339 



Drainage, by surface culture 263 



Availability of fertilizers 359 



