1919] SOILS — FERTILIZERS. 31 Y 



tlie ci'iteria show the soils of a type to be not closely similar, and the types 

 to be-but little differentiated from each other." 



In addition, there are given an historical sketch of the development of soil 

 classification and mapping and a discussion of certain of the methods employed 

 by the Bureau of Soils. It is pointed out that despite its defects the work of 

 the Bureau of Soils is of value, and is practically the only type of soil classifica- 

 tion and mapping possible under the conditions imposed. 



Field operations of the Bureau of Soils, 1914 (sixteenth report), M. Whit- 

 key ET AL. (U. S. Dept. Ayr., Field Oper. Bur. Soils, 1914, PP- 2S.50, pis. 89, figs. 

 73, maps 67). — Supplementing similar work previously noted (E. S. R., 36, p. 

 210), this comprises a general review of the field work conducted by the Bureau 

 of Soils during 1914, together with detailed reports on 78 surveys which have 

 already been noted from time to time. 



During the year 37,618 square miles or 24,075,520 acres were surveyed and 

 mapped in detail, making the total area surveyed and mapped up to January 1, 

 1915, 353,412 square miles or 226,183,680 acres. Reconnoissance surveys cover- 

 ing an area of 40,120 square miles or 25,676,800 acres were also made. 



Soil survey of Howard County, Ark., M. W. Beck, M. Y. Longacee, F. A. 

 Hayes, and W. T. Carter, jr. {U. S. Dept. Agr., Adv. Sheets Field Opcr. Bur. 

 Soils, 1917, pp. Jf8, pis. 3, fig. 1, map 1). — This survey deals with the soils of an 

 area of 385,280 acres situated in the southwestern part of the State and lying 

 in the southern part of the Appalachian Mountain and Plateau Province and 

 in the northern part of the Gulf Coastal Plain Province. The topography of 

 the northern section of the region is hilly to mountainous and of the southern 

 part level to gently rolling. Natural drainage is generally well established. 



The soils of the county include residual upland soils derived from sandstone 

 and shale, sedimentary upland soils, terrace or old alluvial soils, and first -bottom 

 or recent alluvial soils. In addition to rough stony land and chalk, 33 soil 

 types of 21 series have been mapped. Hanceville stony fine sandy loam and 

 Hanceville fine sandy loam, occuping 21.8 and 11.5 per cent of the total area, 

 respectively, comprise the prevailing types. 



Analyses of soils of DeKalb County, W. A. Worsham, jr., D. D. Long, L. M. 

 Carter, M.-W. Lowry, and W. O. Collins {Ga. State Col. Agr. Bui. 163 {1919), 

 pp. 29, pi. 1, figs. 3). — This bulletin reports and discusses chemical analyses of 

 samples of each of the 11 soil tyiJes found in an area of 174,080 acres in north 

 central Georgia. 



The discussion of analyses indicates that the upland soils of the county are 

 fairly well supplied with potash, with the exception of the Iredell types. The 

 bottom soils and at least two of the upland types are considered to be abun- 

 dantly supplied with potash. The nitrogen and phosphoric acid contents aro 

 low in all the upland types. Nitrogen and organic matter are considered to be 

 the limiting fertility factors of the soils of the county, followed by phosphoric 

 acid, and liming and deep tillage of the soils are considered advisable. 



A considerable variation in the composition of the different soil types of the 

 county is shown. 



Analyses of soils of Dougherty County, W. A. Worsham, jr., D. D. Long, 

 L. M. Carter, and M. W. Lowky {Ga. State Col. Agr. Bui. 126 {1917), pp. //7, pi. 

 1, figs. Jf). — This bulletin reports and discusses chemical analyses of samples of 

 soil from each of the 24 soil types of an area of 219,520 acres in southwestern 

 Georgia. 



The analyses indicate that phosphoric acid is the limiting factor in the fer- 

 tilitj' of these soils, and that the nitrogen and potash contents are generally 

 low. It is al.so concluded that these soils are in need of lime and deep tillage. 



