20 EXPERIMENT STATION RECOED. (Vol.36 



SOILS— FERTILIZEItS. 



Soil survey of Jefferson County, Arkansas, B. W. Tillman, R. R. Bubn, 

 W. B. Cobb, C. Lounsbury, and G. G. Strickland {U. S. Dept. Agr., Advance 

 Sheets Field Operations Bur. Soils, 1915, pp. SO, fig. 1, map 1). — This survey, 

 made in cooperation with the Arkansas Experiment Station and issued Septem- 

 ber 25, 1916, deals with the soils of an area of 561,920 acres in southeast- 

 central Arkansas, which comprises two general divisions, " an upland plain 

 in the western part of the county and a lower river flood plain. The upland 

 is prevailingly level, with small undulating to gently rolling areas. The lowland, 

 or river bottom, section is a nearly level plain bordering the Arkansas River, 

 with narrow extensions reaching into the upland along the smaller streams." 

 '• The drainage of much of the forested upland is deficient, owing to the level 

 topogi'aphy." 



The soils are classed as upland or sedimentary soils and lowland alluvial 

 soils. Twenty-two soil types of 10 series are mapped, of which the Portland 

 clay and very fine sandy loam and the Caddo silt loam cover 17.8, 16.9, and 13.7 

 per cent of the area, respectively. 



Kankakee County Soils, C. G. Hopkins, J. G. Mosier, E. Van Alstine, and 

 F. W. Garrett (Illinois Sta. Soil Rpt. IS (1916), pp. 12, pis. 2, figs. 10).— This 

 is the thirteenth of the Illinois county soil reports. Kankakee County is located 

 in eastern Illinois and has been covered completely by the Illinoisan and the 

 early Wisconsin glaciations. 



The soils of the county are divided into upland prairie soils rich in organic 

 matter, upland timber soils, terrace soils, late swamp and bottom land soils, 

 and miscellaneous soil types. The brown silt loam prairie soils cover 35.74 

 per cent of the area, the brown sandy loam terrace soils 31.63 per cent, and 

 the brown sandy loam prairie soils 13.12 per cent. " The variation among the 

 different types of soil in Kankakee County with respect to their content of 

 important plant food elements is very marked. The deep peat contains in the 

 plowed soil of an acre thirty times as much nitrogen as the dune sand, and 

 about five times as much nitrogen but only one-fifth as much potassium as 

 the brown silt loam. The total supply of phosphorus in the surface soil varies 

 from 560 lbs. per acre on the upland and 720 lbs. on the terrace, in the yellow- 

 grny sandy loams, to 2,200 lbs. in the black clay loam terrace. The magnesium 

 and calcium vary from about 3,000 or 4,000 lbs. in the lighter terrace soils to 

 15,(X)0 or 20,000 lbs. in some other types. Some types contain an abundance 

 of limestone, while others are practically neutral or slightly acid, and still 

 others, such as the brown-gray silt loam on tight clay and the yellow-gray 

 sandy loam (both terrace soils) and all upland timber soils, are distinctly 

 acid in the surface, more strongly acid in the subsurface, and sometimes devoid 

 of limestone even in the subsoil. More than 90 per cent of the soils of the 

 county contain no limestone in the surface or subsurface to a depth of 20 in." 

 B/econnoissance soil survey of north part of north-central Wisconsin, W. J. 

 Getb, a. E. Taylor, L. R. Schoenmann, C. C. Thompson, T. J. Dunnewald, 

 W. C. Boardman, C. B. Post, and A. R. Albert (U. S. Dept. Agr., Advance 

 Sheets Field Operations Bur. Soils, 1914, PP- 76, pis. 6, figs. 2, map 1). — This 

 survey, made in cooperation with the Wisconsin Geological and Natural History 

 survey and issued September 15, 1916, deals with the soils of an area of 2,828,160 

 acres in north-central Wisconsin, the topographic features of which are charac- 

 teristic of a glacial region. The surface varies from level to rolling and hilly. 

 Including peat and rough stony land, 25 soil types of 9 series are mapped of 

 which peat covers 20.4, Gloucester sandy loam 15.9, Spencer silt loam 15.1, and 

 Gloucester fine sandy loam 13.9 per cent of the area. 



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