538 



EXPERIMENT STATION RECORD 



•Soils— Continued . 



adobe, salts in, (30) 517. 

 adsorption— 



and acidity in, (36) 117. 

 in, (30) 321; (31) 814; (33) 22, 411, 420; (37) 624. 

 of potassium and phosphate ions by, (35) 

 17. 

 adsorptive power, (34) 18, 515. 

 adsorptive power, determination, (31) 119. 

 aeration— 



and drainage, (33) 97. 



by earthworms, (26) 619. 



ecological significance, (37) 213. 



effect on plant growth, (27) 821. 



experiments, use of pits in, (40) 629. 



importance, (36) 724, 733. 



notes, (27) 419; (28) 684; (34) 334, 514; (36) 



320. 

 relation to forestry, (39) 648, 

 relation to root growth, (40) 30, 820. 

 relation to temperature, (34) 216. 

 studies, (40) 718, 739. 

 agricultural adaptations of, (26) 718; (31) 35, 



418. 

 air-dried, changes in, (30) 123. 

 algae in, (28) 31. 

 alkali, see Alkali. 



alluvial, of Falcat basin, Eritrea, (33) 418. 

 American, composition, (28) 28. 

 amino acids in, (34) 515, 

 amino acids in, behavior, (27) 500; (28) 813; (29) 



124. 

 ammonia — 



absorption and nitrification in presence of 



zeolites, (39) 520. 

 absorption by, (34) 719. 

 evaporation and transformation in, (26) 



525. 

 extraction from, (40) 203. 

 fljcation in, (37) 318. 

 fixing power, (27) 322. 

 formation in, (27) 721. 

 formation in, as aflfected by salts, (39) 218. 

 ammoniflcatiou, see Ammoniflcation. 

 ammonifying eflJciency, (27) 517; (28) 31. 

 analyses, (26) 26, 127; (27) 216, 320, 321, 416; 

 (28) 217, 493, 736; (29) 119; (30) 618, 622, 818; (31) 

 24; (32) 122; (33) 204, 205, 212, 213, 214, 321; (34) 

 810; (37) 114; (39) 423. 



insufficiency, (28) 30. 



paper on, (32) 121. 



relation to plant yield, (26) 519. 



value, (29) 512; (30) 119, 513; (32) 321; (33) 

 421, 811; (36) 617. 

 and crops, textbook, (30) 695. 



plants, relationship, (28) 37, 718. 



plants, water relation between, (34) 521. 



soil fertility, textbook, (28) 794. 



soil management, course in, (38) 897. 

 animal organisms of, (34) 306. 

 antagonism of salts m, (31) 721. 

 arable, formation, (36) 114. 

 arable, nitrogen content, (30) 716. 

 arid- 

 brown niter spots in, (35) 724. 



fertilizers for, (36) 726. 

 . humus nitrogen problem in, (35) 513. . 



humus of, (34) 719. 



mechanical analyses, (26) 719. 



nitrification in, (29) 21, 211. 



nitrogenous fertilizers for, (34) 219, 621, 

 arsenic content, (30) 321, 423. 

 as affected by- 

 absorbents, (36) 214. 



aldehydes, (31) 620. 



alfalfa, (40) 319, 719, 722. 



ammonium sulphate, (34) 622. 



arsenic, (32) 730; (34) 421. 



bastard trenching, (30) 236. 



beech leaves and litter, (35) 119. 



calcium, (32) 33. 



calcium carbonate and sulphate, (39) 821. 



caustic lime and chalk, (32) 399. 



chlorids, (35) 423. 



climate, (30) 514; (31) 214; (35) 210. 



continuous cropping, (35) 813. 



cowpeas, (34) 420. 



disinfectants, (31) 620. 



dynamite, (34) 125, 819. 



Soils — Continued. 



as affected by — continued. 



earthworms, (30) 425. 



fairy-ring fungi, (38) 222. 



fertilizers, (27) 622; (30) 219; (32) 31, 721; (33) 

 122; (35) 216, 516. 



freezing, (26) 618. 



frost, (29) 212. 



fungus parasites of plants, (29) 150. 



green manuring, (39) 326. 



heating, (26) 618, 722; (30) 419; (31) 25, 216, 

 620; (32) 721; (35) 138, 722. 



humus, (30) 122. 



irrigation and manure, (36) 816. 



lime, (27) 218; (29) 5lO; (31) 220. 



long-continued one-sided fertilizing, (28) 

 624. 



manganese, (40) 820. 



molasses, (27) 419. 



nucleic acid, (26) 814. 



organic solvents, (37) 422. 



partial steriHzation, (28) 121. 



plant growth and fertilizers, (27) 124; (28) 

 520. 



plant residues and sugars, (40) 121. 



plant roots, (30) 120; (33) 216. 



radioactivity, (33) 23. 



salts, (26) 618. 



sawdust from various woods, (39) 325. 



silicic acid in lime, (26) 34. 



smoke, (27) 229; (32) 422. 



sodium arsenite, (33) 623. 



soluble salts, (26) 216. 



sterilization, (29) 22; (35) 515. 



storage, (38) 619. 



sugar, (27) 722. 



volcanic ash, (29) 726. 



weather, (31) 214. 



wet cultivation for rice, (38) 117. 

 atmospheric pressure in, (26) 323. 

 auto-irrigators for, (38) 719. 

 bacillus radicicola in, (29) 423; (33) 121. 

 bacterial- 

 content as affected by carbon dioxid gas, 

 (39) 618. 



flora of, (30) 819. 



slime in, (27) 620. 



toxins in, (32) 399. 

 bacteriological — 



analysis, (28) 425; (29) 824; (39) 312. 



analysis, error in, (36) 214. 



analysis, sampling for, (39) 618. 



studies, (28) 416. 



tests, (26) 322; (40) 317. 

 bacterio-toxins in, (27) 621. 

 bacterio-toxins, nonpersistence, (40) 23. 

 bacterium lactis viscosum in, (40) 214. 

 barren, studies, (31) 819. 

 benzene derivatives in, (30) 610. 

 biochemical factors in, (27) 500; (28) 29. 

 biochemical processes in, (34) 217; (40) 615. 

 biological- 

 absorption, (27) 20; (31) 313. 



actions, measuring, (36) 116. 



activity, relation to concentration of solu- 

 tion, (39) 323. 



analysis of, (31) 216. 



changes in, during storage, (37) 17. 



changes, solution as index, (39) 813. 

 biology of, (28) 416. 

 black, improvement, (27) 416. 

 black, of Oued R'Dom Valley, Morocco, (28) 



717. 

 black pigment of, (36) 815. 

 blasting, (32) 85. 



bleached, in North Sea marshes, (30) 514. 

 blow, control, (32) 793. 

 blowing, management, (31) 25. 

 bog, see Bog. 



brown, of Europe and Asia, (27) 416. 

 brown, of Java and Malay Peninsula, (34) 811. 

 "brown spots" in, (39) 323. 

 calcareous- 

 black alkali in, (38) 18. 



effect on plants, (27) 824; (31) 627, 816; (36) 

 726. 



relation to pineapple chlorosis, (28) 121; 

 (29) 623. 



utilization, (29) 632. 

 calcium compounds in, (36) 621. 



