INDEX OF SUBJECTS. 



991 



Soil moisture— Continued. 



coefficient 626 



conservation, Ariz 725 



N.Dak 211 



Investigations, N.Mex 620 



studies, Nebr 724 



organisms, steam-formalin treatment for. 645 



productivity, increasing 329 



judging 820 



sanitation, relation to cereal cropping. . 516, 820 

 solutions- 

 plants as indicators of relative density 212 



preparation 203 



sterilization — 



eflfect on plant food production 122 



studies 221 



surfaces, penetration by rain, Ariz 426 



surveys in Indiana 815 



United States, U.S.D.A 16 



temperature- 

 investigations, Mich 618 



relation to plant growth 19 



variation, relation to crop production. . . 416 

 water, composition as affected by culti- 

 vation and manures 416 



Soiling crops for summer feeding 473 



Soils, Actinomycetes in 222 



alkali, reclamation with Bermuda grass, 



U.S.D.A 330 



analyses 119 



arid, nitrification in 21,211 



as affected by- 

 frost 212 



fungus parasites of plants 150 



lime, Hawaii 210 



sterilization, N.Y.Cornell 22 



volcanic ash, Alaska 726 



Bacillus radicicola in 423 



bacterial activity in 123, 817 



Mich 20 



bacteriological examination, Iowa 824 



behavior of amino acids in 124 



calcareous — 



relation to pineapple chlorosis, P.R. 623 



utilization 632 



citrus, fertilization 317 



clay, fixation of ammoniacal nitrogen by 127 



conserving moisture in, P.R 85 



crop-limiting factors in 515 



cultivated, absorption by 315 



decline in productiveness . . 516 



denitrification in 817 



determination of protozoa in 123 



distribution and loss of lime in, Md 128 



dried, bacteriological studies 325 



effect on — 



composition of wheat, Wash 834 



marsh plants 531 



root crops 577 



substances in suspension and in so- 

 lution 19 



vegetation 513 



wheat 835 



erosion as affected by forests 842 



by wind 811 



•th«r and chloroform extracts of, Tex. . 801 



Page. 



Soils, evaporation from 125 



N.Dak 211 



fertilizer requirements 521 



forest, as affected by silvicultural prac- 

 tices 343 



bacterial activity in 325 



glacial, of Indiana 815 



graphite, effect on plants 19 



handbook 193 



highland, acidity in 816 



hygroscopic coefficient, Nebr 724 



importance of colloids in .-. 817 



Improvement, lU 820 



increasing organic matter in, U.S.D.A. 540 



irrigated, drainage 684 



laboratory exercises on 598 



lessons on 395 



lime requirement 797 



loess, origin 415 



loss of fertilizers from, Fla 211 



ly simeter investigations 125 



manual 315 



marling 19 



methods of analysis 308 



micro-organisms in 122, 123, 515 



mineralogical examination 19 



moor, as affected by lime 823 



effect of mixing with lighter soil . 19 



fertilizers for 516 



of northwest Germany, studies.. 514 



nitrate formation in, N.Y.Cornell 818 



nitrification in, Va 621 



nitrogen fixation in, Colo 621 



of California, distribution of humus in . 415 

 Colorado, ammonifying efficiency 



and algal content 819 



Cuba, analyses and fertilizer needs. . 416 



Egj'pt, permeability 816 



Florida, classification and use 416 



Everglades, analyses 315 



Hartford quadrangle, Kentucky 513 



India, bacteriological analysis 220 



Iowa, bacterial content 515 



Kamenm, analyses 727 



La Salle County, Illinois, 111 727 



Malay, analyses 727 



Minnesota, origin 830 



Mississippi, notes. Miss 416 



Nebraska, bacteria in 733 



New Zealand, analyses 728, 730 



Northwest, fertilizer requirements. . . 821 



Obrigheim and Colgenstein, Bavaria. 125 



Porto Rico, studies, P.R 17, 622, 815 



Quebec and Ontario, analyses 233 



South Africa, analyses 514 



South Dakota, notes, S . Dak 19 



southern Italian SomalUand 416 



Sulphur Spring Valley, Ariz 725 



Sutter Basin, California, U.S.D.A... 125 



Tennessee, lime for, Tenn 25 



Utah, studies, Utah 18 



western Australia, fertility 315 



Yamethin district, Burma, analyses. 736 



organic constituents of 817 



osmosis in 124 



packing experiments. Can 223 



