iqiq] ALWAY, McDOLE, 6- TRUMBULL— SUBSOIL 207 



normal weather conditions they vary much from place to place, thus 

 rendering the results obtained in single borings unrehable as an 

 index of the general moisture conditions. 



University Farm 

 St. Paul, Minn. 



LITEIL^TURE CITED 



1. Alway, F. J., Studies on the relation of the non-available water of the soil 

 to the hygroscopic coefficient. Nebr. Agric. Exp. Sta. Research Bull. 3. 

 pp. 122. figs. 37. 1913. 



2. Alway, F. J., and McDole, G. R., The loess soils of the Nebraska portion 

 of the Transition Region. I. Hygroscopicity, nitrogen, and organic carbon. 

 Soil Science 1:107-238. pi. j. figs. 2. 1916. 



3- . Relation of the water-retaining capacity of a soil to its hygroscopic 



coefficient. Jour. Agric. Research 9:27-71. figs. 4. 1917. 



4. Alway, F. J., and Rost, C. 0., The loess soils of the Nebraska portion of 

 the Transition Region: IV. IMechanical composition and inorganic con- 

 stituents. Soil Science 1:405-436. figs. 2. 1916. 



5. Briggs, L. J., Dry-farming investigations in the United States. Rep. 

 84th Meeting Brit. Assn. Adv. Sci., 1914. pp. 263-282. pl.j. fig. 7. 1915. 



6. Briggs, L. J., and Shantz, H. L., The wilting coefficient for different 

 plants and its indirect determination. U.S. Dept. Agric, Bur. PI. Ind. 

 Bull. 230. pp. 83. pi. 2. figs. g. 1 91 2. 



7. Burr, W. W., The storage and use of soil moisture. Nebr. Agric. Exp. 

 Sta. Research Bull. 5. pp. 88. 1914. 



8. Grace, 0. J., The effect of different tunes of plowing small grain stubble 

 in eastern Colorado. U.S.D.A. Bull. 253. 1915. 



9. RoTMiSTROV, V. G., The nature of drought according to the evidence of 

 the Odessa Experiment Field, pp. 48. figs. 20. Odessa. 1913. 



10. Shantz, H. L., Natural vegetation as an indicator of the capabiUties of land 

 for crop production in the Great Plains Area. U.S. Dept. Agric, Bur. PI. 

 Ind. Bull. 201. pp. 100. pi. 6. figs. 23. 1911. 



11. Tinsley, J. D., and Vernon, J. J., Soil and soil moisture investigations in 

 the season of 1901. N.M. Agric. Exp. Sta. Bull. 38. pp. 94. pi. 11. fig. i. 

 1901. 



