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AGRICULTURAL INDEX 



Soils — Con tin lied 

 What we are learning about plants. P. A. 



Lehenbauer. Am Flor 56:623-4 Ap 16 '21 

 Wind and the soil. Ag R 13:4 Ja '21 

 Wonders of soils and plants. M. K. Boyer. 

 Am P Advocate 28:271 Mr '20 



See also Agricultvire; Drainage; Fertili- 

 zers; Humus; Irrigation; Loams; Manures; 

 Marl; Marsh lands: Tillage; also headings 

 beginning Soil and Soils 



Alkali content 

 See Soils, Alkali 



Ammonia content 



Deternaination of ammonia in soil. D. J. Mat- 

 thews. J Ag Sci 10:72-85 Ja '20 

 See also Ammonification 



Analysis 



See Soil analysis 



Bibliography 

 Soils and fertilizers; list of publications for 

 sale by Supt. of doc. (Price list 46 — 14th 

 ed.) 22p '21 Supt. of doc, Washington, D.C. 



Calcium content 



Acid soil studies: changes in calcium com- 

 pounds added to acid soils. R. H. Robinson 

 and D. E. BuUis. bibUog Soil Sci 11:363-7 

 My '21 



Notes on the effect of calcium sulfate on 

 soils. M. M. McCool. Mich Ag Exp Quar B 

 V 2:97-9 N '19 



Proposed method for the estimation of total 

 calcivim in soils and the significance of this 

 element in soil fertility. O. M. Shedd. bibliog 

 Soil Sci 10:1-14 Jl '20 



Relation of the calcium content of some 

 Kansas soils to the soil reaction as deter- 

 mined by the electrometric titration. C. O. 

 Swanson and others, bibliog J Ag Research 

 20:855-68 Mr 1 '21 



Translocation of calcium in a soil. B: D. 

 Wilson, bibliog il Cornell Ag Exp Memoir 

 17:299-324 '18: Same. Cornell Ag Exp Rep 

 1919, V 1:299-324 '20 



Carbon content 



Preliminary investigation into the occurrence 

 of different kinds of carbonates in certain 

 soils. F. Hardy. J Ag Sci 11:1-18 Ja '21 



Simplified wet combustion method for the 

 determination of carbon in soils. D. D. 

 Wavnick. J Industrial & Eng Chemistry 

 (Am. Chemical Soc, Easton, Pa. 60c) 11: 

 634-6 Jl '19 



Variability in soils and its significance to past 

 and future soil investigations; variations in 

 nitrogen and carbon in field soils and their 

 relation to the accuracy of field trials. D. D. 

 Waynick and L. T. Sharp, bibliog Cal Univ 

 Pub Ag Sci V 4,no 5 121-39p '19 (20c) 



Classification 



Classification of humu.-j-free and humus-poor 

 mineral .soils of Sweden according to their 

 consistencies. A. Atterberg (Int. Mitt. Bod- 

 enk.. 6. no. 1:27-37 '16). Exo Sta Record 41, 

 no 6:510-11 10 



Colloid content 

 See Soil colloids 



Composition 

 Calcium and magnesium content of virgin 



and cultivated soils, J. W. Ames and C. J. 



Schonenberger. bibliog Soil Sci 8:323-35 O '19 

 Changes in the physical composition caused 



by the conversion of dry soil into paddv 



soil. W. H. Harrison. (In Yearbook. 1917, 



p. 73-6; '17 Madras ag. dept., Madras 

 Determining the absolute salt content of soils 



by means of the freezing-point method. 



O: J. Bouyoucos and M. M. McCool. bibliog 



J Ag Research 15:331-6 N 11 'IS 

 Effect of sulfofication and nitrification on 



potassium and other soil constituents. J. W. 



Ames and G. E. Boltz. bibliog Soil Sci 7: 



1S3-95 Mr '19 



Influence of the mechanical composition of 

 the soil on the availability of nitrate of soda 

 and dried blood, il N J Ag Exp Rep 1917: 

 335-50 '18 



Minnesota glacial soil studies; a comparison 

 of soils on the late Wisconsin and lowan 

 drifts. C. O. Rost and F: J. Alway. bibliog 

 il maps Soil Sci 11:161-205 Mr '21 



Organic matter in soils. R. M. Salter. Sugar 

 23:559 O '21 



Physical investigation of soil. B. A. Keen. Ag 

 News 20:161-2 My 28 '21 



Physical properties of soils. Tropical Ag 56: 

 283-7 My '21 



Seasonable hints on soil and its tillage. J 

 Ag (Quebec) 22:187 Ap '19 



Soil; chemical elements. Wallaces' F 44:686 

 Mr 14 '19 



See also Soil bacteriology; Soil fungi; Soil 

 microbiology; Soil protozoa 



Crotonic acid content 

 See Crotonic acid 



Experiments 



Abnormality of soils in field-placed cylinder 

 experiments. C. A. Mooers. Soil Sci 7:247- 

 51 Ap '19 



Changes in composition of the soil and of 

 the water extract of tlie soil, following ad- 

 dition of manure. P. L. Hibbard. bibliog 

 Soil Sci 7:259-72 Ap '19 



Contribution to the investigation into the 

 results of partial sterilisation of the soil 

 by heat. V. Elveden. J Ag Sci 11:197-209 

 Ap '21 



Experiments in soil treatment in the Enter- 

 prise district, southern Rhodesia. H. B. 

 Christian, il Rhodesia Ag J 18:405-10 Ag 

 '21 



Facilities for lysimeter and out-door pot cul- 

 ture work at the station. J. F. Barker, il 

 N Y State Ag Exp Tech B 61:1-10 '17; Same. 

 N Y State Ag Exp Rep 1917:47-54 '18 



Freezing point method as a new means of 

 studying velocity of reaction between soils 

 and chemical agents and behavior of equili- 

 brium. G: J. Bouyoucos and W. A. Laude- 

 man. Mich Ag Exp Tech B 37:1-32 '17; 

 Same. Mich Ag Bd Rep 1918:759-85 '19 



Joseon E. AV'ing's unpublished sketches. 

 Breeder's Gaz 79:417 INIr 3 '21 



Relation of the phosphoric acid of the soil 

 to pot experiments. G. S. Fraps. Tex Ag 

 Exp B 267:1-53 '21 



Report of Golden Valley peat experimental 

 fields 1918 and 1919. F. J. Alway. il maps 

 plan Minn Ag Exp B 194:1-116 '20 



Report on soil experiment fields. G: Roberts 

 and A. E. Ewan. Ky Ag Exp B 228:89-120 

 '20 



Soil fertility experiments on DeKalb, Volusia 

 and Westmoreland soils. J. W. White and 

 F. J. Holben. il Pa Ag Exp B 166:1-23 '21 



Soil test experiment in 1918. C: D. Woods. 

 Maine Ag Exp B 278:33-56 '19 



Some effects of potas.sium salts on soils. R. 

 S. Smith, bibliog il Cornell Ag Exp Memoir 

 35:571-605 '20 



Studies on the reactions between soils and 

 various chemical compounds. C. H. Spur- 

 way, bibliog Mich Ag Exp Tech B 51:1-29 

 ■21 



See also Dilatometers; Freezing points; 

 Soil sampling 



Iron content 



Cause of lime-induced chlorosis and avail- 

 ability of iron in the soil. P. L. Gile and 

 J. O. Carrei'o. bibliog il J Ag Research 20: 

 33-62 O 1 '20 



Moisture 

 See Soil moisture 



Nitrogen content 



Comparative effects of various forms of 

 lime on the nitrogen content of the soil. 

 C. A. Mooers and W. H. Mclntire. bibliog 

 Am Soc Agron J 13:185-205 My '21 



Determination of total nitrogen in soils con- 

 taining rather large amounts of nitrates. 

 R. S. Snvder. Soil Sci 6:487-90 D 'IS 



