INDEX 



753 



Colters, types, 672. 

 Commercial value of fertilizer, 560. 

 Complete solution of soil, 328. 

 Composition, of arid and humid soils, 

 72. 



of animal manures, 584. 



of alkali, 391. 



of cumulose soil, 37. 



of crops, 419. 



of drainage water, 369. 



of gases from manure, 594. 



of glacial soil, 52. 



of glacial and residual clay, 68, 69. 



of humus, 131, 140. 



of horse and cov? manure, 581. 



of loess, 60. 



of marl, 38. 



of manure litter, 580. 



of plants, 127, 418. 



of residual and marine soil, 66. 



of rotted manure, 596. 



of residual soil, 33. 



of soil in general, 2. 



of soil-forming minerals, 9. 



of soil due to weathering, 29. 



of soil separates, 101. 



of subsoil, 332. 



of soil air, 139, 477. 



of surface water, 373. 



of yard manure, 578. 

 Composting manure, 613. 

 Concentration and growth, 417. 

 Concrete tile, 641. 

 Condensation, heat of, 209. 

 Conduction of heat in soil, 307. 

 Conservation of moisture in irrigation, 



710. 



Convection in soil, 307. 

 Coprolites as fertilizer, 512. 

 Cornell tanks, composition of drainage 



water, 372. 

 Cornell University, bacteria in soil, 429. 



effect of magnesium, 539. 



nitrates in soil, 451. 



production of manure, 587. 



soil inoculation, 462. 

 Cottonseed meal, as fertilizer, 507. 

 Cover crops and green manure, 620. 

 Covered barnyards for manure, 605. 

 Cow manure, composition, 584. 

 Creatinine, plant-food, 497. 

 Cropping, alternate in dry-farming, 714. 

 Cropping, effect in soil ventilation, 488. 

 Crops, composition of, 419. 



drought-resistant, 715. 



effect of alkali on, 394. 



3o 



Crops, efficiency of fertilizer, 568. 



feeding power, 415. 



for green manure, 622. 



suited to basic soils, 385. 



suited to acid soil, 384. 

 Crumb structure, 109. 

 Crushers and packers as soil pulverizer, 



678. 



Cultivators, types, 673, 

 Cultures, mixed nitrogen-fixing, 464. 

 Cultures of nitrogen-fixing bacteria, 458, 



461. 



Cumulose soils, 35. 

 Cyanamid, nitrogen fertilizer, 502. 

 Cyanamid in fertilizer mixtures, 566. 

 Cytase, enzyme, 440. 



Dam, canvas, 701. 

 Damping-off fungi in soil, 425. 

 Dead furrow, objectionable, 671. 

 "Dead" furrows,- for drainage, 635. 

 Decay of green manure in soil, 622. 



of organic matter in soil, 128. 



organic, and soil temperature, 315. 



and putrefaction, 443. 



of rocks, law of, 24. 

 Decomposition of organic matter, 440. 

 Decomposition of rock, 14. 

 Deep-tilling plow, 667. 

 Deflocculation of sodium nitrate, 499. 

 Delta defined, 41. 

 Denitrification, 456. 

 Denudation, rate of, in U. S., 14. 

 Denudation by Mississippi River, 15. 

 Deoxidation as weathering agent, 20. 

 Department of Agriculture, U. S. Nitro- 



culture, 462. 

 Depth of moisture storage in soil, 710. 



for plowing, 669. 



of soil in relation to humus, 148. 



of soil mulch, 278. 



of tile drains, 646. 

 Detention of plant-food in soil, 332. 

 Dewey system of classification, 726. 

 Diabase, 6. 



Diffusion of gases in soil, 483. 

 Dihydroxystearic acid, 376. 

 Diorite, 6. 



Disease of plants and moisture, 253. 

 Diseases of plants, effect of lime, 536. 

 Disease organisms in soil 426. 

 Disease resistance, effect of phosphorus, 

 550. 



effect of nitrogen, 549. 

 Disintegration of rock, 14. 

 Disk harrow, single and double, 676. 



