INDEX 



Absorption of metals by soil and 

 plant, 551-553. 



Acid ion, in soil-washing phenom- 

 ena, 329. 



Altalfa, effects of copper tailings 

 and cultivation, 474-478. 



Alkali salts, in soils, 21, 24; effect 

 on aluminum reduction meth- 

 od, 55; damage caused, 275. 



Alkali Soil Treatment, New Ex- 

 periments on, 275. 



Alkali soils, determination of 

 nitrates, 51; gray land, 196; 

 humus in, 266, 267; treatment 

 experiments, 275, basis, 276, 

 method. 277, results, 278-279, 

 plates illustrating, opp. 284, 

 286, 288, 290; reclamation, 

 332; black, 320. 



Alum, ordinary, effects on nitrate 

 determination, 29; used in 

 clearing soil solution, 22. 



Aluminum cream, used in clearing 

 soil solutions, 22; effects, with 

 bone black, on nitrate deter- 

 mination, 30. 



Aluminum Reduction Method as 

 Applied to the Determination 

 of Nitrates in "AlkaU" 

 Soils, 51; description, 53; 

 compared with phenoldisul- 

 phonic acid method. 55; effect 

 of: alkali salts, 55, soluble 

 organic materials, 59; time 

 required, and effect of tem- 

 perature on, 60; amount of 

 NaOH. 61; conclusions, 62. 



Ammonia in soils, determination, 

 128; stimulation of arsenic to 

 production, 129. 



Ammonification, in pure cultures 

 of: cottonseed meal, 153-156, 

 dried blood, 144-149, fish 

 guano, 156-159, sheep and 

 goat manure, 160-162, pep- 

 tone, 160-162, tankage, 149- 

 153; availabilities of organic 

 materials, 162, 164, 165, 166; 

 efficiencies of organisms, 167- 

 169: results, summary, 171. 



Ammonification in soil columns of 

 California, 6-10; in soils, ef- 

 fect of calcium and mag- 

 nesium carbonate, 41-44; de- 

 ternnnations, 128, 131; ex- 

 periments, 130; toxic effects 

 of copper, iron, lead, and zinc 

 sulphates, 13i^. 



Ammonification in Soils by Pure 



Cultures, Studies on, 141. 

 Ammonifying flora, agents in 

 transforming organic nitro- 

 gen, 6; affected by copper, 

 zinc, iron, and lead, 127, 139; 

 physiological differences in 

 nitrifying flora, 137. 

 Ammonium bicarbonates, chlor- 

 ides, and sulfates, effects on 

 soil colloids, 327, 328. 

 Arid regions, soils: aeration, and 

 its effect on biological condi- 

 tions, 16; ammonifying and 

 nitrifying powers, 180; bac- 

 teria: distribution and activi- 

 ties, 1, 2-4, 20, studies in soil 

 samples, 2-6, 18; comparison 

 with humid soils, 270, 272; 

 depth, 1 ; deep jienetration of 

 plant root systems, 2, 20. 

 Arsenic in soils, stimulating power 

 to ammonia and nitrate pro- 

 ductionj 129. 

 Aspergillus niger, 128. 

 B. icteroides, culture experiments, 

 142. 



megatherium, 142. 



mesentericus vulgatus, 142. 



mycoides, 142, 144. 



proteus vulgaris, 142. 



ramosus, 142. 



subtilis, 142, 144. 



tumescens, 142. 



vulgaris, 142. 



vulgatus, 142. 

 Bacteria in Soils of the Arid Re- 

 gion, The Distribution and 

 Activities of, 1. 

 Barley, deep rooting, 186. 

 Barley Growth in Pot Cultures, 

 Experiments on the Effects of 

 Constituents of Solid Smelter 

 Wastes on, 495; objects, 496; 

 methods, 497; types of soil, 

 and preparation, 497, chem- 

 ical analysis, 498, irrigation, 

 498; variety of barley, 499; 

 leaf colors, 500; tillering, 

 501; height, 503; germination 

 of seeds, 504; yields, 505; 

 nitrogen content, 550, 562. 

 See also Copper sulfate; Fer- 

 rous sulfate: Lead sulfate; 

 Manganese salts; Zinc sulfate. 

 Bat guano. See Guano. 



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