1920] 



INDEX OF SUBJECTS. 



901 



Soil — Continued. 



moisture — continued. 



colloidal hypothesis, 20. 

 conservation by pruning, 235. 

 effect on explosives, I'.S.D.A., 282. 

 equivalent, effect on analysis, 210. 

 factors affecting, 210, 320. 

 movement, Ky., 812 ; N.Mex., 738. 

 movement after Irrigation, N.Mex., 



386. 

 movement as affected by gravity, 



U.S.D.A., 723. 

 movement as affected by initial 



moisture, Ky., 320. 

 movement, capillary, U.S.D.A., 722. 

 movement, capillary transmission 



constant, 812. 

 studies, Wash., 722. 

 molds, factors affecting number, Iowa, 



432. 

 organisms, dissemination by wind, 842. 

 plate, number of colonies for, 422. 

 potassium, liberation, 127. 

 preparation for field crops, 321. 

 reaction, relation to health and growth 



of plants, 513. 

 science, methods of teaching, 19G. 

 solution, concentration, effect on cell 



sap, 515. 

 survey In — 



Alabama, Shelby Co., U.S.D.A., 



511. 

 California, Ventura area, U.S.D.A., 



512. 

 Delaware, Kent Co., U.S.D.A., 719. 

 Florida, St. Johns Co., U.S.D.A., 



719. 

 Georgia, Pulaski Co., U.S.D.A., 



811. 

 Indiana, Cass Co., 419. 

 Iowa, Hamilton Co., U.S.D.A., 



122. 

 Louisiana, La Salle Parish, 



U.S.D.A., 720. 

 Mississippi, Madison Co., U.S.D.A., 



720. 

 Nebraska, Morrill Co., U.S.D.A., 



209. 

 North Dakota, Sargent Co., 



U.S.D.A., 12.3. 

 North Dakota, Traill Co., U.S.D.A-, 



209. 

 Oregon, Yamhill Co., U.S.D.A., 512. 

 South Carolina, Horry Co., 



U.S.D.A., 812. 

 Texas, Lubbock Co., U.S.D.A., 512. 

 Virginia, Accomac and North- 

 ampton Counties, U.S.D.A., 513. 

 West Virginia, Webster Co., 



U.S.D.A., 720. 

 Wisconsin, Waupaca Co., U.S.D.A., 

 123. 

 survey mapping, 887. 

 surveys, device for making, Tex., 281. 

 temperature, daily changes, 321, 



Soil — Continued, 



temperature, relation to that of 

 springs, 321. 



water. (See Soil moisture.) 

 SoUs — 



acid, effect on zinc-coated pots, 27. 



acid humiferous, as affected by lime, 

 325. 



acid, lime requirements, 115. 



acid, Trufast test for, 20. 



alkali. {See Alkali.) 



ammonia determination in, 211. 



as affected by dicyandlamid, 426. 



as affected by straw. Wash., 720. 



as affected by sulfoficatlon, 517. 



barium in, Ky., 327. 



bog. (See Bog.) 



carbon dloxld balance, factors affect- 

 ing, 510. 



carbon dloxid of, N.Y.Cornell, 812. 

 chemistry of, 122. 

 chlorid determination in, 311. 

 colorimetric determination of pH, 211. 

 cropped and cultivated, water absorp- 

 tion and run-off on. Mo., 721. 

 cropped and virgin, Mich., 622. 

 distribution of electric currents from 



traction lines, 625. 

 effect of fertilizers on pH, 423. 

 effect of lime and manure, Okla., 32. 

 fertilizer requirements as determined 



by crop analysis, ,323, 518. 

 freezing-point lowering, studies, 515. 

 frozen, bacteria in, 422. 

 heated, relation to root cork, 732. 

 humus, aqueous solutions of, 725. 

 humus, humin acids in, 213. 

 improvement — 



for corn, 422. 



rOle of lime In, 128, 428. 



with lupines, 321. 



with peat and moor soils, 22. 

 injurious effects on plants, 513. 

 introductory courses in, 196. 

 leaching, effect on availability of rock 



phosphate, 427. 

 lime requirement. Wis., 622. 

 lime requirement — 



factors affecting, 312. 



methods of determining, 713. 



relation to pH, 421, 515. 

 limed and unlimed, analyses, 128. 

 loss of nitrates in drainage water, 19. 

 magnesium determination in, N.Dak., 

 319. 



marsh. (See Marsh soils.) 



moor. (See Peat and Moor.) 



muck. (See Muck soils.) 



nitrate accumulation in, excessive, 216. 



nitrate production after timothy and 



clover crops, 215. 

 nitrate production, factors affecting, 



111., 214. 

 nitrification studies, Pa., 515. 

 nitrifying bacteria in. Isolation, 216. 



