SUBJECT INDEX 



539 



Soils— Continued. 



caliche, composition, (35) 511. 



capacities for irrigation water, (39) 213. 



capillarity, (28) 622. 



capillary lift of, measurement, (30) 22; (31) 720. 



carbon determination in, (40) 308. 



carbon dioxid production in, (31) 127; (38) 118. 



carbon dioxid treatment, (39) 618, 620; (40) 739, 



820. 

 carbon-nitrogen relations, (38) 421. 

 carbonized material in, (28) 418. 

 Caribou loam, fertilizer requirements, (39) 327. 

 Carrington loam, (27) 18, 512. 

 catalysis, studies, (28) 118. 

 catalytic power, (30) 425. 

 Catlin's River, analyses, (26) 719. 

 cellulose-destroying power of, (31) 313. 

 cementing material, plant food value, (27) 513. 

 characterizing according to molecular compo- 

 sition of silicates, (31) 22. 

 chemical — 



changes, microbial agency in, (38) 322. 



characterization, (27) 417. 



criteria of productivity, (40) 120. 

 chemistry of, (28) 416; (31) 515; (32) 618. 

 chemistry of— 



discussion, (26) 717. 



progress in, (30) 212. 



review of investigations, (30) 119. 



status, (32) 718. 



studies, (40) 125. 



treatise, (30) 512. 

 cherozem — 



classification, (28) 515. 



nitrate content, (34) 618. 



notes, (28) 319. 



of Northern Caucasus, (37) 516. 



of Russia, (26) 812; (27) 619. 



sterilization, (38) 17. 

 cherry orchard — 



analyses, (35) 720. 



chemical and biological notes, (33) 640. 

 Chester loam, (27) 17. 

 chlorin absorption, (40) 619. 

 chlorin and sulphur content, (30) 422. 

 circulation of moist air in, (31) 26. 

 circulation of nitrates in, (28) 720; (30) 623. 

 citrus, fertilization, (29) 317. 

 classification, (26) 421; (27) 117, 320, 615; (28) 

 515, 537; (30) 621; (31) 719; (32) 200, 618; (35) 

 319, 812, 899; (36) 210, 813; (38) 512. 

 classification — 



mechanical, (35) 319. 



mechanical, chemical criteria, and produc- 

 tivity, (40) 120. 



physical principles, (26) 434. 

 clay — see also Clay. 



as affected by hydroxyl ions, (31) 216; (32) 

 318. 



as affected by marling, (30) 23. 



colloids of, (35) 319. 



fixation of ammoniacal nitrogen by, (29) 

 127. 



improvement, (31) 723. 



in vicinity of Mexico City, Mexico, (36) 

 19. 



of Limburg, Netherlands, (38) 513. 



plasticity of, (26) 220. 

 cleaning for microscopic examination, (33) 109. 

 climate, and plant growth, relationship, (2fl) 



616. 

 Clyde series, (32) 316. 

 coconut, analyses, (30) 20. 

 coconut, of Malay States, analyses, (32) 420. 

 cogon, crop-producing power, (30) 832. 

 cogon, improvement, (31) 38. 

 cohesion in, (30) 214, 215; (36) 117. 

 colluvial, of Missouri, (3l) 720. 

 Coloma sand, studies, (39) 323. 

 colored sandstone, of Germany, (31) 513. 

 compaction by tractors, (36) 400. 

 composition, (28) 620; (30) 613; (34) 619. 

 composition — 



as affected by moles, (27) 619. 

 affected by rainfall, (35) 514. 

 affected by sewage irrigation, (26) 614. 

 affecting nitrogen utilization, (39) 726. 



Soils— Continued. 



composition— continued. 



terminology, new, (28) 318. 

 variation in, (37) 811. 

 conservation, (27) 20. 

 copper determination in, (40) 807. 

 cotton, of— 



India, nature, (27) 823. 

 Nyasaland and Uganda, (27) 217. 



South Carolina, fertilizer requirements, (28) 

 196. 

 course in, elementary, (27) 96. 

 course in, extension, (35) 194. 

 courses at Iowa State College, (35) 319. 

 courses in, (36) 595. 



cranberry, limed, Azotobacter in, (40) 214. 

 creatinin in, origin, (26) 815. 

 creatinin isolation from, (26) 419, 420. 

 crop-limiting factors in, (29) 515. 

 cropped and bare, studies, (39) 517. 

 Crowley silt loam, (27) 17. 

 cultivated — 



absorption by, (29) 315. 



absorption of salts by, (34) 324. 



adsorption phenomena, (27) 20. 



decline in productiveness, (29) 516. 



formation of nitrates in, (26) 319. 



function of humus in, (26) 422. 



loss of nitrogen and organic matter from, 

 (33) 809; (34) 516. 



niter spots in, (32) 29. 



nitrate reduction in, (40) 319. 



of Cuba, (27) 117. 

 Cyanophyceae in, (34) 513. 

 dark, correlation of humus and mineral matter 



in, (33) 720. 

 decalcification by smoke, (31) 521. 

 decomposition of cyanamid and dicyanodlamid 



in, (40) 724. 

 decomposition of peptone and cellulose in, (34) 



813 

 deep'tUlage for, in Great Plains, (39) 812. 

 DeKalb, fertilizer experiments, (39) 22; (40) 299, 



723. 

 DeKalb, fertilizer requirements, (38) 219. 

 Deli, of Sumatra, investigations, (28) 621. 

 denitrification in, (27) 424; (29) 817; (32) 618. 

 destructive distillation, (33) 120. 

 determination of— 



biological solution, (33) 120. 



capillary pull, (33) 618. 



critical moisture content, (32) 719. 



easily soluble matter in, (26) 519. 



firmness and plasticity, (27) 320. 



outer surface, (26) 219. 



Rhizobia in, (27) 620. 



surface area, (30) 816. 



volume weight, (36) 197; (37) 18; (39) 213. 

 disinfection, (33) 250; (36) 623; (37) 319, 619. 

 disinfection with carbon dioxid, (31) 248. 

 distribution of— 



sUt and clay in, (28) 28. 



vertical pressure in, (35) 581. 

 dried, bacteriological studies, (29) 325. 

 dried, increased nitrate content, (32) 817, 

 drift, of Norfolk, England, (26) 120. 

 dry-farm, nitrogen and humus content, (31) 318. 

 drying, (27) 121; (28) 622; (33) 810. 

 dynamiting in the Great Plains, (39) 812. 

 effect on — 



agriculture, (36) 417. 



avaUabUity of fertUizers, (34) 130; (36) 819. 



burning quality of tobacco, (38) 239. 



cereals, (26) 814. 



composition of medicinal plants, (34) 18. 



composition of wheat, (26) 133; (29) 834; (30) 

 440; (38) 518. 



cultivated crops, (33) 825. 



drainage water, (26) 619. 



Egyptian cotton, (28) 833. 



firmness on root development, (30) 136. 



forest yields, (37) 450. 



marsh plants, (29) 531. 



mineral content of feeds, (28) 364. 



nitrogen relations of crops, (40) 822. 



pecans, (34) 151. 



plant varieties, (28) 537. 



protein content of soy beans, (28) 721. 



