CHAPTER XXXI 



TEE SOIL SURVEY 



The function of the soil survey is to investigate the 

 nature and occurrence of soils in the field. The soils are 

 classified into areas having approximately the same crop 

 relations and tillage properties. The location of the areas 

 of each kind of soil is represented on charts or maps, and 

 their character and chief economic and agricultural rela- 

 tions are described in printed reports. 



617. The classification ^ of soils by survey. — The 

 occurrence of differences in the tillage and manurial re- 



1 Klassifieation, Nomenclature, und Kartierung der Boden- 

 artea. 



Verhandlungen der zweiten internationalen Agrogeologenkon- 

 f erenz. (Proceedings of the Second International Agro-geological 

 Conference, Stockholm, Chapter V, pp. 223-298. (Seven papers.) 

 1911. 



Report on Soli Classification. Proc. Amer. Soe. Agron., Vol. 

 6, No. 6, pp. 284-288. 1914. 



Pippin, E. 0. The Practical Classification of Soils. Proc. 

 Amer. Soc. Agron., Vol. 3, pp. 76-88. 1911. 



Marbut, C. P. Soils of the United States. U. S. D, A., 

 Bur. Soils, Bui. 96, pp. 7-16. 1913. 



Colmey, G. N. A Study of the Soils of the United States. 

 U. S. D. A., Bur. Soils, Bui. 85, p. 114. 1912, 



Hall, A. D., and Russell, E. J. Soil Surveys and Soil Analy- 

 sis. Jour. Agr. Sci., Vol. 4, Part 2. 1911. 



Tularkov, N. The G-enetie Classification of Soils. Jour. 

 Agr. Sci., Vol. 3, pp. 80-85. 1909. 



Stevenson, W. H., Christie, G-. I., and Willcox, 0. W. The 



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