INDEX OP SUBJECTS. 



903 



Page. 



Soil investigation, historical methods 714 



in Minnesota 18 



southern Illinois, 111 120 



management, studies 714 



maps, nature and importance 620 



moisture— 



as aflected by manure 125 



tillage 222,223 



effect on action of fertilizers 121 



plant growth 130 



yields of hay. Pa 522 



investigations 19 



Nebr 222 



U.S.D.A 434 



maintenance, Colo 231 



relation to crop rotation, N.Dak 715 



plant diseases 740 



studies, Pa 522 



utilization by plants 121 



nitrates, effect on trees, Colo 221 



seasonal changes in, U.S.D.A. . 122 



organic compounds, complexity CIO 



organisms, effect on anthracnose. La 250 



particles, coverings, studies 715 



phenomena, dynamic nature 714 



phosphates, availability 010 



physics, investigations 146 



productivity as affected by colloid sul)- 



stances 319 



reactions, effect on potato scab, R.I 21 



solution investigations 223, 714 



sterilizing plant, description 623 



surveys by United States Bureau of Soils 18 



temperatures, measurement 296 



report on, Pa 522 



studies 310 



types, relation to moisture 314 



water, effect on soil fertility 023 



zones in Roumania 315 



Russia 316 



Soiling crops, fertilizer experiments 427, 633 



for cows, Pa 579 



summer, for Massachusetts, 



Mass 580 



varieties 627 



Soils, absorption 714 



acid , continuous culture of barley on . 3 1 9, 320 



formation of toxic compounds in . 226 



acidity as affected by various salts 320 



in, correction, W.Va 129 



alkali, as affected by nitric acid 022 



fixation of nitrogen in 622 



use of phenols in analysis 705 



ammonifying powers in, determination, 



U.S.D.A 508 



analyses IS, 22, 23, 129, 232, 235, 



243,326,515,010,715,729 



N.Dak 715 



U.S.D.A 641 



Va.Truck 716 



and manures, treatise 319 



as affected by — 



alkaloidal solutions 726 



carbon bisuli)hid 123 



continuous use of fertilizers, Pa 524 



fertilizers 226,320 



Page. 

 Soils, as affected by— Continued. 



magnesia 319 



phosphates, R.I 21 



pyrogallol 023 



salt solutions 714 



sorrel. Pa 254 



sterilization 221 



N.Y.Comell 316 



sunlight and fire 123 



zmc 129 



bacterial activity in, determination 611 



basalt, vegetation on 223 



bibliography 95 



biochemical cycle of phosphoric acid in. 317 

 carbon dioxid in, during growth of 



plants 523 



charting, value of chemistry in 415 



chernozem, fertilizer requirements 224 



classification 232, 416 



clay, analysis and classification 315 



composition as affected by afforestation 245 



variations in. Pa 521 



conservation, U.S.D.A 421 



and use in North Carolina 520 



containing soda, field investigations. . . 415 



corn, fertilizers for, U.S.D.A 138 



cotton, of India, nature 316 



cultivated, denitrification in 430 



fixation of nitrogen in 430 



rfileofmicain 715 



denitrification in 123 



U.S.D.A 123 



determination of cellulose-decomposing 



power in 610 



enzyms in 131 



effect on composition of wheat. Wash.. 407 



flax 40 



grape roncet 550 



nitrogen content of wheat 710 



examination, Fla 441 



in the Rhone Valley 710 



fallow, care of, U.S.D.A 434 



fen, fertilizers for 319,320 



fertilizer requirements 23 



Mo 20,21 



Nev 21 



P.R 238 



R.I 21 



fixation of nitrogen in 429 



Colo 221,523 



plant food by 18 



flocculation and deflocculation in 521 



forest, physical characteristics 146 



formation and classification 18 



decomposition of hu- 

 mus 621 



of ammon ia and nitrates in . . 621 



free publications on 495 



Injurious substances in 023 



irrigated leucite, fertilizing constituents. 710 



lime requireiTienls, Mass 720 



lo.sses of plant food from 18 



marsh, fertilizer requirements 224 



mechanical analyses 239 



methods of analysis 18, 112, 410, 523 



moor, free humus adds In 715 



