302 SOIL SCIENCE [Bot. Absts., Vol. V, 



2312. Tartar, H. V., and F. C. Reimer. The soils of Jackson County. Oregon Agric. 

 Exp. Sta. Bull. 164. 62 p. 1 map. 1920.— An area of approximately 544 square miles of valley 

 and adjacent hill and mountain land in the central part of Jackson County were studied. 

 The soil types are numerous and fall principally into two classes, residual and alluvial, rang- 

 ing from fine sandy loam to clay adobe. Results of chemical analyses of the most important 

 soil types showed, that there is an abundant supply of potassium, calcium and magnesium, 

 that none are acid, that the phosphorus supply is only fair to low, that the nitrogen content 

 (also organic matter) is prevailingly low, and that sulfur is present in most of the soils in 

 quantities so small that it is one of the limiting factors in the growth of crops making large 

 demands for that plant food. Irrigation and drainage are needed in some places. — E. J. 

 Kraus. 



2313. Thorp, W. E., and H. J. Harper. Soil survey of Blackhawk County, Iowa. 

 Advance sheets, Field Operations Bur. Soils, U. S. Dept. Agric. 1917: 7-43. 1 fig., 2 pi., 1 

 map {colored). 1919. — For character report see Bot. Absts. 5, Entry 2316. 



2314. Tillman, B. W., F. A. Hayes, and F. Z. Htjtton. Soil survey of Drew County, 

 Arkansas. Advance sheets, Field Operations Bur. Soils, U. S. Dept. Agric. 1917 : 5-46. 1 fig. , 

 1 map (colored). 1919. — For character of report see Bot. Absts. 5, Entry 2316. 



2315. Tillman, B. W., and B. F. Hensel. Soil survey of Phelps County, Nebraska. 

 Advance sheets, Field Operations Bur. Soils, U. S. Dept. Agric. 1917: 5-40. 1 fig., 1 map (col- 

 ored). 1919. — For character of report see Bot. Absts. 5, Entry 2316. 



2316. Tillman, B. W., and B. F. Hensel. Soil survey of Wayne County, Nebraska. 

 Advance sheets, Field Operations Bur. Soils, U. S. Dept. Agric. 1917: 5-47. 1 fig., 1 map 

 (colored). 1919. — Situated in northeastern Nebraska, Wayne County covers about 450 square 

 miles. The topography is uneven, ranging from hills to level areas. Three-fourths of the 

 county is upland, one-eighth bottom land and the remainder terrace. The bottom areas lie 

 at about 1500 feet above sea level, while the hills are 160 feet higher. — The climate is suited 

 to general farming, with an annual precipitation of 28 inches and a mean annual temperature 

 of 48°F. The growing season of 144 days receives about one-half of the annual rainfall. — 

 The upland soils, comprising 76 per cent of the county, are loess of the Marshall and Knox 

 series. The former is a black soil while the latter is light brown. Both are silt loams, and 

 quite productive. The sedimentary soils, covering 17.5 per cent of the county are the most 

 productive although the terrace areas, ranking with the loess in fertility, are excellent. — 

 The main industry of the county is agriculture. The principal crops are corn, oats, alfalfa, 

 clover, timothy, wheat and hay. Wheat is about the only cash crop. Over one-third of the 

 crop acreage every year is corn. Stock raising is constantly receiving greater attention. — 

 Progressive farmers follow systematic crop rotation. Drainage, especially on the bottom 

 lands, is being rapidly developed. Good crops are obtained in all parts of the county although 

 the production is below what it should be for soils of such high natural fertility. The crop- 

 ping systems in vogue are not keeping up the productiveness of the land. More attention 

 should be paid to green manures and legumes. — H. 0. Buekman. 



2317. Van Duyne, C, L. R. Schoenmann, and S. D. Averitt. Soil survey of Shelby 

 County, Kentucky. Advance sheets, Field Operations Bur. Soils, U. S. Dept. Agric. 1916: 

 5-64. / fig., 1 pi., 1 map (colored). 1919. — For character of report see Bot. Absts. 5, Entry 

 2316. 



2318. Van Duyne, C, W. E. McLendon, W. J. Latimer, and I. M. Morrison. Soil 

 survey of Marlboro County, South Carolina. Advance sheets, Field Operations Bur. Soils, 

 U. S. Dept. Agric. 1917: 5-72. 2 fig., 1 map (colored). 1919. — Marlboro County occupies a 

 belt in northeastern South Carolina extending from the crest of the Sandhill region down into 

 the lower Coastal Plain. The elevations range from 140 to 300 feet. The area is in part undu- 

 lating and in part flat and poorly drained. Drainage is into the Pee Dee River. — The winders 



