576 



INDEX OF SUBJECT MATTER 



Inoculation of soil with B. Radicicola, 



methods of, 439. 

 Insulation, absorbed by earth's atmos- 

 phere, 226. 

 absorbed by soil, 227. 

 absorption of as influenced by color, 



228. 

 absorption of as influenced by slope, 



229. 

 received by soil, 225. 

 Insoluble phosphoric acid, defined, 456. 

 Inspection and control of fertilizers, 480. 

 Ions, absorption of by soils, 270. 

 differential diffusion of, 293. 

 diffusion of into plants, 291. 

 Ionization, defined, 270. 



of water, 270. 

 Irrigation, relation to rise of alkali, 339. 

 Irrigation water, alkali content of, 333. 

 Iron, in soil minerals, 7. 



relation to the reversion of acid 



phosphate, 457. 

 relation of to soil acidity, 347. 



Kainit, reinforcement of manure with, 



527. 

 Kaolinite, importance in soils, 7. 



source of in soil, 6. 

 Kelp, a source of potash, 465. 

 Kjeldahl method for determination of 



nitrogen, 312. 



Lacustrine soils, character of, 60. 



glacial lake, 58. 



importance of, 60. 



location in U. S., 60. 



recent lake, 60. 

 Lake salines, a source of potash, 465. 

 Law of diminishing return, 493. 

 Leaching, effect of on soil acidity, 352 



loss of lime thereby, 370. 



use of in alkali eradication, 341. 

 Leather meal, composition of, 446. 

 Legumes, inoculation of, 438. 

 Leguminous crops, amounts of nitrogen 

 fixed by, 438. 



cross inoculation of, 434. 



effect on soil nitrogen, 437. 



nitrogen fixation by, 433. 

 Leucite as a fertilizer, 465. 

 Lime, agricultural terminology of, 364. 



agricultural use of, 363. 



Lime, amounts to apply, 368. 



biological effects in soil, 371. 

 burned, 364. 

 carbonated, 365. 

 cause of crop response to, 372. 

 changes in soil, 369. 

 chemical effects of on soil, 871. 

 composition of as sold in Pennsylva- 

 nia, 366. 

 contact action of, 374. 

 conversion factors of, 367. 

 crop response to, 372. 

 effect of caustic forms on manure, 



530. 

 forms of, 363. 

 forms to apply, 367. 

 importance of in soil improvement, 



381. 

 influence of green manures on, 545. 

 influence on availability of nutrients, 



373. 

 influence on decay of green manures, 



551. 

 influence on granulation, 143. 

 influence on nitrification, 373. 

 influence on soil bacteria, 395. 

 influence on sulfofication, 405. 

 losses from Cornell soils, 307, 370. 

 methods of applying, 374. 

 need of determinations, 365. 

 physical effects on soil, 371. 

 problem showing form to buy, 368. 

 proper utilization of, 382. 

 relation of to fertilizer mixtures, 



486. 

 relation to reversion of monocalcium 



phosphate in soil, 457. 

 relation to the use of manure and 



fertilizers, 382. 

 time to apply, 374. 

 use of manure with, 530. 

 use of with green manure, 551. 

 water slaked, 364. 

 Lime requirement determinations, on 



soils, 355. 

 types of, 355. 

 Lime requirement of soils, Veitch method, 



356. 

 Limestone, amounts to ;>ply, 368. 

 burning o 



changes ii k . 370. 

 chemical of, 33. 



