622 EXPERIMENT STATION RECORD. [Vol. 43 



The soils of the Detroit area, M. M. McCool and G. M. Grantham (Michi- 

 gan Sta. Quart, liiil., 2 {,1920), No. Jf, pp. 192-105, fig. i).— Data on the lake bod 

 soils of an area of 987,520 acres in eastern Michigan are reported. 



Tlie surface features of the area consist of sand drift, level to undulating 

 lands, old deltas, gravelly ridges, and river flood plains and terraces. The 

 Clyde clay loam, which comprises the black swamp region, is the most exten- 

 sive type. It is well supplied with nitrogen and has an average content of 

 phosphorus and potash but requires drainage. The Clyde silt loam comprises 

 about 30 per cent of the area. It is well supplied with nitrogen and potash but 

 requires phosphorus and drainage. The Dunkirk sandy loam covers about 15 

 per cent of the area. 



The soils of northern Wisconsin, A. R. Whitson, T. J. Dunnewald, and C. 

 Thompson (Wisconsin Sta. Bui. 306 (1919), pp. 45, pis. Jf, figs. S).— This is a 

 survey, made in cooperation with the Wisconsin Geological and Natural His- 

 tory Survey and the Bureau of Soils of the U. S. Department of Agriculture, 

 of the soils of upper Wisconsin, particularly of an area of about 8,500,000 acres 

 of farm laud and 2,000,000 acres of pasture and forest which are yet un- 

 occupied. 



There are 10 principal soil types in this region, including sands, light sandy 

 loams, heavy sandy loams, silt loam with a well-drained subsoil, silt loam 

 with heavy subsoil, silt loam on limestone, heavy red clay, poorly drained soils, 

 peat and muck, and rough or very stony soils. Heavy sandy loam is said to be 

 the most common soil and one of the most valuable in the area, followed by 

 silt loam in acreage. The silt loam with a heavy subsoil is said to be one of 

 the most uniform in the region. Considerable information is included on the 

 crops best adapted to the different soil types. 



Survey of soil conditions in Bavaria, H. Niklas (Forstw. Ccntbl., n. ser., 

 J!i2 (1920), No. 4, pp. 123-135). — The author groups the soils of Bavaria into 7 

 relief zones according to their texture and cropping adaptabilities as follows: 

 Zone 1, prevailingly heavy soils adapted to wheat and meadow culture ; zone 2, 

 heavy soils adapted mainly to barley culture; zone 3, medium soils adapted 

 to barley culture ; zone 4, in which neither heavy nor light soils prevail, adapted 

 to general cropping of all kinds; zone 5, in which neither light nor medium 

 soils prevail, adapted to oats and rye and some barley culture; zone 6, pre- 

 vailingly light soils adapted to rye and oats culture; and zone 7, containing 

 soils of all kinds which are adapted to meadow culture, mainly owing to the in- 

 fluence of climatic conditions, rainfall especially. These zones cover the area as 

 follows : Zone 1, 13 per cent ; 2, 12 per cent ; 3, 14 per cent; 4 and 5, 17 per cent; #; 

 6, 31 per cent ; and 7, 13 per cent. * 



A comparative study of cropped and virgin soils, C. E. IMillab (Michi- 

 gan Sta. Quart. Bui., 2 (1920), No. 4, pp. 195, 196). — An extension of experi- 

 ments previously reported (B. S. R., 41, p. 420) to include soils from many sec- 

 tions of Michigan couflrms the conclusions of the previous report. 



Further studies to determine the nature of the material going into solution 

 showed a larger total residue for the virgin than for the depleted soils. A 

 large part of this residue was volatile, and while all the extracts showed large 

 quantities of organic matter there are considerable quantities of carbonates 

 present in the extracts which would be decomposed on ignition. More calcium 

 was extracted from virgin than from cropped soils. These experiments are 

 being continued. 



Testing soils for acidity, E. Truog (Wisconsin Sta. Bui. 312 (1920), pp. 24, 

 pl. 1, figs. i2).— Popular information is given on soil acidity and lime require- 



