AGRICULTURAL INDEX 



1025 



Soils — Nitrogen content — Continued 



Effect of alfalfa on the fertility elements of 

 the soil in comparison with grain crops. C. 

 O. Swanson and W. L. Latshaw. bibliog 

 map Soil Sci 8:1-39 Jl '19; Summary and 

 conclusions. Ag Gaz of Canada 7:280-1 Mr 

 '20; Abstract. Exp Sta Record 42:425-6 Ap 

 ■20 



Effect of various crops upon the water extract 

 of a typical silty clay loam soil. G. R. 

 Stewart and J. C. Martin. J Ag Research 

 20:663-7 Ja 15 '21 



Inrtuence of salts on the nitric-nitrogen ac- 

 cumulation in the soil. J. E. Greaves and 

 others, bibliog J Ag Research 16:107-35 Ja 

 27 'Vi; Abstract. Int R Sci & Prac Ag 10.no 

 7:815-16 Jl '19 



Influence of wheat straw on the accumula- 

 . tion of nitrates in the soil. H. Scott, bib- 

 liog Am Soc Agron J 13:233-58 S '21 



Lime factor in permanent soil improvement; 

 rotations without legumes. J. G. Lipman 

 and A. W. Blair, bibliog Soil Sci 9:83-114 

 F '20 



Maintaining nitrogen in Illinois soil. O Judd 

 Farmer 68:600 Mr 20 '20 



Nitrate production in field soils in lUinoi.s. 

 A. L. Whiting and W. R. Schoonover. Ill 

 Ag Exp B 225:21-63 '20 



Nitrogen economy in the soil as influenced by 

 various crops grown under control condi- 

 tions. R. C. Wright, bibliog Soil Sci 10:249- 

 8:) O '20 



Nitrogen losses and lime. C. A. Whittle. Am 

 Fert 55:73-4-1- N 5 '21 



Nitrogen losses under intensive cropping. J. 

 G. Lipman and A. W. Blair, bibliog il Soil 

 Sci 12:1-19 Jl '21 



Nitrogenous compounds in soils. C. B. Lip- 

 man. Assn Offlc Ag Chem J 3:326-8 F '20 



Nitrogenous compounds in soils. J. K. Plum- 

 mer. Assn Offic Ag Chem J 4:106-7 Ag '20 



Organic matter of the soil: a study of the 

 nitrogen distribution in different soil types. 

 C. A. Morrow. 79p bibliog '18 Univ. of 

 Minn., Minneapolis; Abstract. Exp Sta Rec- 

 ord 43:18-19 Jl '20 



Thesis not available for distribution 



Organic nitrogenous compounds in peat soils. 

 C. S. Robinson and E. J. Miller. 11 Mich 

 Ag- Sxp Tech B 35:1-29 '17; Same. Mich Ag 

 Bd Rep 1918:684-712 '19 



Soluble non-protein nitrogen of soil. R. S. 

 Snyder and R. S. Potter. Soil Sci 6:441-8 D 

 'IS 



Studies on nitrification in natural soils and 

 its importance from an ecological point of 

 view in Sweden. H. Hesselman. Ag Gaz of 

 Cflnad.=> 6:1A02 X '19 



Studies on the acid amide fraction of the 

 nitrogen of peat. E. J. Miller and C. S. 

 Robinson, bibliog Soil Sci 11:457-67 Je '21 



Supply of nitrogen in the soil. J. W. Ames. 

 Ohio Ag Exp B V 5:174-7 Je '20 



Surfeited with nitrogen. W. W. Weir, il 

 Hoard's D 60:691 -|- N 5 '20 



Symbiotic nitrogen fixation as influenced by 

 the nitrogen in the soil. W: A. Albrecht. 

 bibliog il Soil Sci 9:275-319 My '20; Sum- 

 mary. Ag Gaz of Canada 7:768-9 S '20 



Value of liming in a crop rotation with and 

 without legumes. J. G. Lipman. Am Soc 

 Agron J 13:206-10 My '21 



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) 

 S<-/> also Nitrification 



Phosphorus content 

 Organic phosphorus content of Ohio soils. C. 

 J. Schollenberger. bibliog Soil Sci 10:127- 

 41 Ag '20 

 Organic phosphorus of soil. R. S. Potter and 

 R. S. Snyder, bibliog Soil Sci 6:321-32 O '18 

 Organic phosphorus of soil: experimental 

 work on methods for extraction and deter- 

 mination. C. J. Schollenberger. bibliog Soil 

 Sci 6:365-93 N '18 

 Short test for easily soluble phosphate in 



soils. O. M. Shedd. bibliog Soil Sci 11:111- 

 ,0 p -21 



Solubilitv of soil phosphorus. C. H. Spurway. 



Mich Ag Exp Quar B v 3:28-30 Ag '20 

 Technique of determination of soil phos- 



phoi-us. H. A. Noyes. Assn Oftic Ag Chem J 



4:93-4 Ag '20 



See also Phosphates 



Potassium content 

 Effect of manure-sulphur composts upon the 



availability of the potassium of greensand. 



A. G. McCall and A. M. Smith, bibliog J Ag 



Research 19:239-56 Je 15 '20 

 Liberation of native soil potassium induced 



by different calcic and magnesic materials, 



as measured by lysimeter leachings. W. H. 



Maclntire. bibliog il Soil Sci 8:337-95 N '19 

 Use of silica crucibles for the determination 



of potassium in soils. J. S. Jones and J. C. 



Reeder. Soil Sci 12:419-32 N '21 



Sampling 



See Soil sampling 



Study and teaching 



Introductory course in soils. A. B. Beaumont. 

 Am Soc Agron J 13:79-81 F '21 



Introductory courses in soils. R. S. Smith. 

 Am Soc Agron J 12:58-60 F '20 



Teaching of elementary soils. H. O. Buck- 

 man. Am Soc Agron J 12:55-7 F '20 



Teaching- of soils. M. F. Miller. Am Soc Ag- 

 ron J 13:71-8 F '21 



Teaching of soils in agricultural colleges. W. 

 H. Stevenson and P. E. Brown. Am Soc 

 Agron J 13:63-70 F '21 



What is the value of the usual laboratory 

 work given in general soils courses? P. E. 

 Karraker. Am Soc Agron J 11:253-6 S '19 



Sulfur content 



Sulfur supplied to the soil in rainwater. B. 

 D. Wilson, bibliog Ani Soc Agron J 13: 

 226-9 My '21 



/S'ee also Sulfofication; Sulfur as fertilizer 



Testing 



Effect of zinc in soil tests with zinc and gal- 

 vanized iron pots. S. D. Conner. Am Soc 

 Agron J 12:61-4 F '20 



Trufast test for sour soil. E. O. Fippin. Am 

 Soc Agron J 12:65-8 F '20 



Alabama 



Limestone prairies of Wilcox countv, Ala- 

 bama. R. M. Harper, il Ecol 1:198-203 Jl '20 



Soil survey of Barbour county, Alabama. 

 H. C. Smith and others, map U S Ag Soils 

 Bur Rep 1914:1071-1116 '19 



Soil survey of Clay county, Alabama. A. E. 

 Taylor and others, map U S Ag Soils Rep 

 1915:827-63 '19 



Soil survey of Lawrence county, Alabama. 

 H. G. Lewis and J. F. Stroud, maps U S Ag 

 Soils Bur Rep 1914:1155-1200 '19 



Soil survey of Limestone county, Alabama. 

 R. T. A. Burke and A. M. O'Neal, jr. map 

 U S Ag Soils Bur Rep 1914:1117-53 '19 



Soil survey of Lowndes county, Alabama. 

 L. R. Schoenmann and R. T. A. Burke. 

 (Soils bur. advance sheets) 68p maps '18 

 U S Ag; Same. U S Ag Soils Rep 1916:787- 

 850 '21 



Soil survey of Monroe county, Alabama. 

 H. C. Smith and others. (Soils bur. ad- 

 vance sheets) 53p maps '18 U S Ag; Same. 

 U S Ag Soils Rep 1916:851-99 '21 



Soil survey of Pickens county, Alabama. A. 

 M. O'Neal, jr and others, map U S Ag 

 Soils Rep 1916:901-37 '21 



Soil survey of Wilcox county, Alabama. R. 

 A. Winston and N. E. Bell, map U S As 

 .Soils Rep 1916:939-1005 '21 



Alaska 



Report on a reconnoissance of the soils, ag- 

 riculture, and other resources of the Kenai. 

 peninsula region of Alaska. H. H. Bennett, 

 il maps U S Ag Soils Rep 1916:39-174 '21 



Soil reconnoissance in Alaska, with an esti- 

 mate of the agricultural possibilities. H. H. 

 Bennett and T: D. Rice, il maps U S Ag 

 Soils Bur Rep 1914:43-236 '19 



