Index 



Beans, figure showing growth in 

 soils containing copper as pre- 

 cipitated carbonate, 433. 



Blood, dried. See Dried blood. 



Bone black, and aluminum cream, 

 effects on nitrate determina- 

 tions, 30. 



Burgess, P. S.. .51, 127, 141. 



Calcium in percolate, relation to 

 colloidal diffusion, 309; chem- 

 ical studies of, 310; increased 

 by XaCl, 310. 



Calcium, and magnesium, in salt- 

 treated soils. 311, 313. 



Calcium bicarbonates, chlorides, 

 sulfates, effects on soil col- 

 loids, 327, 328. 



Calcium carbonates, effects on am- 

 mouifieation and nitrification 

 in soils, 39, 41, 45, 49. 



California, advantages of her arid 

 soils, 272. See also Arid re- 

 gions. 



California poppv, deep rooting, 

 186. 



California Wheat. See Wheat, 

 California. 



Carbon dioxide, effect on copper 

 compounds, 468. 



Carbon disulfide, stimulating pow- 

 ers. 129. 



Certain Effects under Irrigation 

 of Copper Compounds upon 

 Crops. 395; acknowledgments, 

 400; bibliography, 487. 



Chamot, cited on tripotassium 

 salt of nitrophenoldisulphonic 

 acid method, 22, 23. 



Clifton-Morenci mining and irii- 

 gation district, Arizona, 39C; 

 map, 398; distribution of cop- 

 per compounds, 401, in ores 

 and tailings, 405. in ground, 

 irrigating, and river waters, 

 407. 



Colloidal matter. See Colloids, 

 soil. 



Colloidal substances. See Colloids, 

 soil. 



Colloids, soil, diffusion, 292, 296, 

 301, 303, 309, 315, 319, 321, 

 325; flocculation, 292. 308, 

 • 326, 327; orsranic, 314; forma- 

 tion, 317; effects of salts, 322, 

 323," 327, 328, 329. 



Copper, effects on ammonifying 

 and nitrifying flora in soils, 

 127, on higher plants. 138; re- 

 actions by which added to 

 water supply, 402; presence 

 in: soils irrigated with tail- 



ings waters, 408, with mine 

 waters, 459, vegetation, 410. 

 411, 461, flesh and bones of 

 pig, 412, corn plants, 413, root 

 systems, 413, 415, 419, plants 

 in water cultures, 417, 418, 

 field samples of soils and veg- 

 etation, 440; stimulating ef- 

 fects in water cultures, 422, 

 in soil cultures, 431, on plant 

 growth, 470, on field crops, 

 472; protein saturation fig- 

 ures, 445, 446, 449, in com- 

 bination with proteids, 464; 

 reactions with growing points, 

 450; resistance of roots, 451, 

 of individual cells, 454; effect 

 on health of man and ani- 

 mals, 460; content in roots 

 and tops of plants, 463; path- 

 ological effects, 466, 467. See 

 also Clifton-Morenci mining 

 district; Copper salts, com- 

 pounds; Copper solutions; 

 Corn; Gila River Mining dis- 

 trict; Moss; Toxic effects of 

 copper; Wheat. 



Copper Compounds. Certain Ef- 

 fects under Irrigation of, 

 upon Crops, 395. 



Copper compounds, in irrigating 

 waters, 399; reactions be- 

 tween, and soil, 402; table of 

 solubilities, 403; irrigation ef- 

 fects upon crops, analysis of: 

 reasrents and apparatus, ores 

 and tailings, soils, 480. waters, 

 vegetation, 481, cleansing 

 roots of adhering copper, 481, 

 plant ashes, 483; varying ef- 

 fects of different compounds, 

 468. 



Copper salts and irritrating sedi- 

 ments, in Gila Eiver waters, 

 473. 



Copper solutions, effects of soil on 

 toxicity, 426; irrigation ex- 

 periments, 428. 



Copper sulfate, effect on: ammoni- 

 fication in soils. 127, 131, 

 nitrification in soils, 127, 133, 

 546-549. higher plants. 138, 

 barlev growth, 505. 509. 512, 

 .5.59, 560, 566. 567-568, plant 

 growth, bibliography with 

 comments, 53.3-539; toxicity 

 to moss, 443; absorption by 

 soil and plant, 551-553. 



Corn, growth, in soils containing 

 copper as: precipitated car- 

 bonate, 433, chalcocite, 434, 



[590] 



