584 



INDEX OF SUBJECT MATTER 



Soils, composition of air in, 247. 



conductivity coefficients of, 236. 

 conditions, effect on nitrification, 



418. 

 control of air in, 261. 

 control of alkali in, 343. 

 control of erosion, 205. 

 cumulose, 42. 

 defined, 2. 



diseases, control of, 397. 

 diseases, nature of, 396. 

 dynamic nature of, 3. 

 eradication of alkali from, 341. 

 erosion of by water, 204. 

 fertility evaluation of by chemical 



analysis, 323. 

 formation of, 16. 

 forms of water in, 152. 

 functions of water in, 184. 

 general composition of, 2. 

 geological classification of, 38. 

 glacial, 54. 



granulation of, defined, 139. 

 handling of alkali soils, 340. 

 heat conduction in, 234. 

 heat convection in, 238. 

 hygroscopic water of, 152. 

 importance of absorption by, 273. 

 influence of earth worms on, 385. 

 insolation received by, 225. 

 lacustrine, 58. 

 losses of water from, 202. 

 management, practical factors of, 



560. 

 marine, 50. 

 method of moisture determination 



on, 161. 

 moisture data of, 200. 

 movement of air in, 258. 

 movement of gravity water in, 175. 

 mulch on, 218. 

 names in common use, 82. 

 names, origin and meaning, 80. 

 nitrification in, 416. 

 nitrogen content of, 118. 

 partial analysis of, 315. 

 partial analysis with strong acids, 



316. 

 partial analysis with weak acids, 



317. 

 particles of, 67. 

 plasticity of, 140. 



Soils, pore space of, 93. 



practical management of, 560. 



productivity of as related to soil 

 solution, 287. 



puddling of, 141. 



reaction, importance of, 345. 



reaction, types of, 845. 



reduction of nitrates in, 424. 



residual, 38. 



sampling of, 311. 



series defined, 86. 



specific gravity of, 88. 



specific heat data, 232. 



sulfofying power of, 405. 



survey classification of, 85. 



tests for acidity in, 354. 



thermal movement of moisture in, 

 182. 



the solution of, 275. 



tilth, defined, 149. 



toxins of organic nature, 108. 



type defined. 86. 



weathering, importance of, 37. 



weight of, data, 93. 



wilting coefficient, 197. 

 Soil acidity, active toxic bases, 346. 



as influenced by absorption, 274. 



causes of development, 352. 



causes of harmful effects, 346. 



expression of by ph values, 350. 



general nature of, 345. 



influence of absorption on, 352. 



influence of fertilizers on, 353. 



influence of leaching on, 352. 



influence on bacteria, 395. 



influence on nitrification, 421. 



lack of calcium in relation to, 348. 



lack of nutrients theory, 348. 



lime requirements, determination of, 

 355. 



litmus paper test for, 358. 



present status of question, 349. 



relation of iron to, 347. 



relation of manganese to, 347. 



resume of, 360. 



tests for, 354. 



theory, aluminum, 347. 



theory, hydrogen ion, 346. 



tolerance of plants to, 353. 



Truog test for, 358. 



types of tests, 355. 



zinc sulfide test for, 358. 



