SOILS FERTILIZERS. 511 



types, 10 soil types of n series are mapped, of wliicli the Miami silt loam 

 covers 63.7 per cent and the Clyde silty clay loam 22.3 per cent of the area. 



Soil survey of Clarke County, Mississippi, A. L. Goodman and E. M. Jones 

 (U.^S. Dept. Agr., Advance Sheets Field Operations Bur. Soils, 191/f, pp. Jfl, fig. 

 1, map 1). — This survey, made in cooperation with the Mississippi Geological 

 Survey and issued December 31, 1915, deals with the soils of an area of 437,760 

 acres in eastern Mississippi, lying wholly within the Coastal Plain province. 

 "It embraces three topographic divisions: (1) The uplands, built up of alter- 

 nating beds of sands and clays, (2) second bottoms, or alluvial terraces, and 

 (3) the broad alluvial first bottoms of streams, subject to frequent overflow. 

 . . . The topography of the uplands ranges from flat through undulating or 

 rolling to hilly and ridgy. The stream bottoms and second bottoms are pre- 

 vailingly flat. While much of the flat terrace land is naturally well drained, 

 there are considerable areas that would be materially benefited by artificial 

 drainage." 



The soils are of sedimentary origin and range in texture from sands to clays. 

 Including meadow, 30 soil types of 18 series are mapped, of which the Ruston 

 fine sandy loam is the most extensive type, with the Orangeburg, Kalmia, and 

 Susquehanna fine sandy loams next in order. 



Soil survey of Grundy County, Missouri, A. T. Sweet and W. I. Watkins 

 (V. S. Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1914, pp. 3/f, 

 pis. 2, fig. 1, map 1). — This survey, made in cooperation with the Missouri 

 Experiment Station and issued January 17, 1916, deals with the soils of an area 

 of 281,600 acres in north-central Missouri. 



" The topography of the greater part of the county is rolling to very rolling, 

 and consists of long ridges of upland separated by long, broad, and nearly 

 parallel valleys. The surface of much of the southwestern part is more broken, 

 but also includes undulating areas of importance." All the upland is said 

 to be well drained. 



The soils of the county are of residual, glacial, and alluvial origin. Eleven 

 soil types of eight series are mapped, of which the Shelby loam covers 41.7 per 

 cent, the Wabash silt loam 17.5 per cent, and the Grundy silt loam 17.1 per 

 cent of the area. 



Soil survey of Scotts Bluff County, Nebraska, L. T. Skinner and M. W. 

 Beck {TJ. S. Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1913, pp. 

 43, fig. 1, map 1). — This survey, made in cooperation with the Nebraska Soil 

 Survey and issued December 31, 1915, deals with the soils of an area of 462,720 

 acres in western Nebraska. 



" Scotts BlufE County ... is in the High Plains region, but most of its 

 area lies within the valley of the North Platte River. . . . The topographic 

 features of the county consist of (1) the remnants of the High Plains, (2) 

 the escarpments, (3) the grade plains on the south side and across the north- 

 east corner, (4) the ancient terrace on the north side now eroded into a rolling 

 topography, and (5) the modern undissected terraces and existing river flood 

 plain." On the basis of origin the soils of Scotts Bluff County are (1) residual, 

 (2) alluvial, (3) eolian, (4) colluvial and alluvial-fan soils, and (5) miscel- 

 laneous types. 



The rather constant winds of this region have considerably modified the 

 surface of practically all the soils of the county. Exclusive of dunesand, 

 meadow, marsh, rough broken land, and Bad Lands, 19 soil types of 9 series 

 are mapped, of which the Mitchell very fine sandy loam, the Tripp very fine 

 sandy loam, the Epping silt loam, and the Mitchell silt loam are, in their 

 order, the largest in extent. 



