INDEX OF SUBJECT MATTER 



569 



Bacteria, shape of, 391. 



seasonal flora, 394. 



spore formation by, 391. 

 Bacteria in soils, character of, 390. 



determination of numbers of, 392. 



factors affecting growth of, 393. 



influence of green manures on, 544. 



numbers of, 392. 



position in soil, 391. 



production of enzymes by, 390. 



size of, 391. 

 Bacterial activity, measured by carbon 



dioxide produced, 256. 

 Bacterial growth, conditions affecting, 



393. 

 Bases, substitution of in soils, 271. 



those used to correct soil acidity, 

 362. 



toxic nature of in acid soils, 346. 

 Basic exchange, 270. 



influence on drainage water, 305. 

 Basic slag, changes in soil, 458. 



character of, 458. 



composition of, 457. 



source of, 457. 

 Beaker method of mechanical soil analy- 

 sis, 69. 

 Biological cycles of the soil, importance 

 of, 398. 



names of, 399. 



nature of, 398. 

 Biological effects of lime on soil, 371. 

 Bog lime, nature of, 45. 

 Bomb method for determining soil or- 

 ganic matter, 114. 

 Bone phosphate, changes in soil, 455. 



character, 454. 



composition, 454. 



source, 454. 

 Brands of fertilizers, 478. 

 Bromberg soil tanks, data from, 306. 

 Brownian movement, explained, 128. 

 Bucher method of fixing nitrogen, 453. 

 Bulk analysis of soils, carbon and nitro- 

 gen, 311. 



mineral constituents, 314. 

 Burned lime, 364. 



Calcium, amount in soils, 13. 

 forms of in soil, 11. 

 importance of in fertility evalua- 

 tions, 324. 



Calcium, in soil minerals, 6. 



lack of in relation to soil acidity, 

 348. 



loss of from soil, 307, 370, 555. 



of di-silicate as an amendment, 380. 



relation to reversion of acid phos- 

 phate, 457. 



use of as lime, 363. 

 Calcium cyanamid, change in soil, 452. 



character of, 452. 



composition of, 452. 



manufacture of, 451. 

 Calcium and magnesium ratio in soils, 



375. 

 Calcium in gypsum as an amendment, 



379. 

 Calcium losses, Bromberg lysimeters, 306. 



from Cornell soils, 307. 

 Calcium nitrate, character of, 452. 



composition of, 452. 



manufacture of, 452. 

 Capillary-absorbed water, defined, 196. 

 Capillary capacity of soils, factors affect- 

 ing, 163. 

 Capillary film, thickness of and effect on 



capillary movement, 171. 

 Capillary movement of soil water, data 

 on rate, 174. 



effect of structure on, 174. 



effect of texture on, 173. 



factors affecting, 170. 



explained, 168. 



influence of film thickness, 171. 



relation to soil mulch, 175. 



role in supplying plants with water, 

 193. 

 Capillary pull of soils, data on, 169. 



determination of, 168. 

 Capillary water of soil, amounts in soil 

 columns, 165. 



colloidal control of, 159. 



defined, 159. 



determination of amount, 161. 



kinds of, 159. 



position of inter film, 160. 



surface tension control, 159. 

 Carbide method of fixing nitrogen, 451. 

 Carbon, cycle of in soil, 399. 



determination of in soil, 113. 



gain of by green manures, 539. 



in Cornell drainage water, 402. 



in organic matter, 113. 



