122 EXPERIMENT STATION RECORD. 



All the areas, with the exception of the Trenton, Cincinnatian, and river al- 

 luvian, are considered to be very deficient in phosphorus and usually deficient 

 in nitrogen. It is stated that " so far as field experiments have been made in 

 the State at large, potassium has not been shown to be a limiting element on 

 any well-drained soil in which there was a good supply of organic matter. . . . 

 The cultivated soils of all the areas are inclined to acidity, especially the sub- 

 soils and badly drained soils. ... In the bluegrass region nitrogen is the only 

 limiting element in the production of profitable crops. In all other sections of 

 the State phosphorus and nitrogen are limiting elements. The soils of the Ches- 

 ter, the Waverly, and the western edge of the eastern coal field are, on the 

 whole, the least fertile soils of the State." 



Soils of Graves County, S. C. Jones (Kentucky Sta. Bui. 194 (1015), pp. 

 169-107, pi. 1). — Tliis bulletin deals with the origin, characteristics, mechanical 

 and chemical composition, crop adaptations, and fertility requirements of an 

 area of 540 square miles in the so-called Purchase Region in that portion of 

 Kentucky lying west of the Tennessee River. 



Three phases of topography are represented in the area, namely, bottom lands, 

 hilly lands, and undulating talile-lands and broad ridges. Graves County is 

 covered entirely by transported soils which have been derived directly from 

 glacial till and loess and are fairly typical of the Purchase Region. The yellow 

 brown silt loam covering 43.39 per cent of the area is the most extensive type, 

 followed in order by the yellow silt loam covering 3G.13 per cent, the light brown 

 silt loam covering 20.28 per cent, and the gray clay loam covering 0.2 per cent of 

 the area. Chemical analyses of the soil types (soil and subsoil) are reported. 



The results of these analyses are taken to indicate that nitrogen is the limiting 

 element in the soils, particularly for grain crops, while where legumes are grown 

 phosphorus is the limiting element. Tlie soils are low in lime and rather strongly 

 acid, especially the gray, poorly drained soils, but they are all relatively well sup- 

 plied with potash. 



The chief factors to be considered in improving and maintaining the fertility 

 of Graves County soils are enumerated as prevention of soil erosion ; practice of 

 crop rotation ; improvement of pasture land ; increasing the organic matter, 

 nitrogen, and phosphorus content of the soil ; liming; and drainage. 



A section by A. M. Peter reporting analyses showing the composition of the 

 soil of the Mayfield experiment field and of three type soils is appended. 



Soil survey of Jones County, Mississippi, .\. L. Goodma.x and I-]. :M. Jones 

 (t7. S. Dcpt. Agr., Advance i<hccis Field Opciations Bur. t<oils, 1913 pp. 35, 

 pi. 1, fig. 1, map 1). — This survey, made in cooperation with the State of Mis- 

 sissippi and issued April 9, 1915, deals with the characteristics of the soils of an 

 area of 445,440 acres in .southeastern Mississippi. The topography of the up- 

 lands varies from flat or gently undulating and rolling to hilly and ridgy. The 

 stream bottoms and terraces are prevailingly flat. The county is drainetl to the 

 South, the eastern part having good surface drainage. The western part contains 

 a large area in which the slopes under cultivation are subject to erosion. 



The soils of the county include upland, terrace, and bottom land types of varied 

 textures, the first being of sedimentary origin and the two last of alluvial origin. 

 Twenty-four soil types, of eleven series, are mapped, the uplands representing five 

 series, the terraces three series, and the bottoms three series. The Ruston soils 

 of the uplands, including fine sandy loam, sandy loam, and gravelly .sandy loam, 

 are the most extensive, covering nearly half the county. The Cahaha .series is 

 said to be the best of the terrace series. All the bottom soils are poorly drained. 

 It is stati'd that the soils of the county are adapted to a wide range of crops. 



Soil survey of Greene County, Missouri, H. H. KnrsEKOPF and F. Z. Hltton 

 (V. S. Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1913, pp. 38, 



