752 



INDEX 



Carbohydrates and nitrogen fixation, 



464. 

 Carbohydrates as source of energy, 456. 

 Carbohydrates in soil, 127. 

 Carbon, 4, 6, 



Carbon dioxide, absorption of, 366. 

 as an influence on climate, 49. 

 and root action, 406, 408. 

 end product of decay, 138. 

 functions in soil, 481. 

 in soil air, 21, 139, 410, 478. 

 in atmosphere, 139. 

 product of decay, 130. 

 production by bacteria, 408. 

 use in soil analysis, 339. 

 Carbon disulfide as soil antiseptic, 465. 

 Carbon disulfide from plant decay, 140. 

 Carbonate of lime, 540. 

 Carbonates of lime, effect on nitrates, 



536. 

 Carbonates, acid test for, 388. 

 Carbonates in earth's crust, 11. 

 Carbonates, effect on soil, 482. 

 Carbonation as weathering agent, 19. 

 Carbonized material in soil, 140, 144. 

 Carriers, in fertilizers, 555. 

 Catalytic action of soil, 528. 

 Catalytic fertilizer, 528. 

 Catch crops, and nitrate conservation, 



455. 

 Caustic lime, 539. 



Cement pit storage of manure, 604. 

 Centrifugal soil analysis, 93. 

 Cephalothecium, disease organism, in 



soil, 426, 

 Cereals, absorptive power, 414. 

 Chabazite, 356. 

 Checking of losses by evaporation, 272. 



of losses by leaching, 267. 

 Chemical agents of rock decay, 14. 

 Chemical analysis of soil, 327. 

 complete, 328. 

 extraction with acids, 329. 

 extraction with water, 340. 

 Chemical changes due to heat, 291. 

 Chemical composition of soils. See 



Analysis. 

 Chili saltpeter, 498. 

 Chloride of potash, 523. 

 Chlorine, 6. 



Chlorine as fertilizer, 544. 

 Chlorite, 9. 



Chloroform as soil antiseptic, 473. 

 Cistern storage of manure, 605. 

 Citric acid meth-od, 336. 

 Class, the soil, defined, 103. 



Class, the soil, in classification, 722. 



Classification of rocks, 6. 



Classification of soil material, geological, 



31. 

 Classification of soil particles, 95. 

 Classification of soil, factors used, 720. 

 Classification of soil, outline of, 721. 

 Clostridium pastorianum, 463. 

 Clay, character of separate, 98. 

 Clay, colloidal, 161. 

 Climate and acidity, 382. 

 Climate and efficiency of fertilizer, 568. 

 Climate, influence on soil, 65. 

 Climate as factor in soil classification, 



Clouds, effect on radiation, 306. 

 Clod crushers, 678. 

 Coefficient of cohesion, 175. 

 Coefficients of drainage, 651, 652. 

 Coefficients of expansion of rocks, 17. 

 Coefficient of friction, 229. 

 Coefficient of hygroscopicity, 208. 

 Coefficient of plasticity, 171. 

 Coefficient of wilting, 257, 25S. 

 Cohesion defined, 1^73. 

 Cohesion, determination, 174. 

 Cohesion, control, 183, 197. 

 Cohesion, factors affecting, 178. 

 Cold and heat as weathering agents, 16. 

 CoUecfcotrichum, disease organism in 



soil, 426. 

 Colloids in the soil, 153. 

 Colloids, absorption by, 359. 



and acids, 165. 



chemistry, 153. 



effect of roots on, 411. 



estimation of, 166. 



factors affecting, 165. 



organic, 140. 



preparation of, 163. 

 Colloidal humus, 133. 



materials, 346. 



matter, relation to phosphates, 517. 



phases, 158. 



state, 154. 

 CoUuvial soils described, 38. 

 Color of soil, 73. 

 Color of soils, due to weathering, 20. 



due to humus, 75. 



due to iron, 75. 



agricultural significance, 78. 



and temperature, 301. 

 Color of arid and humid soils, 72. 



of glacial soil, 53. 



of marine soil, 44, 



of residual soil, 33. 



