30 COMPOSITION OF ROTHAMSTED SOIL 



In general, it may be said that the Rothamsted soil 

 presents no striking peculiarities, either chemical or physical. 



REFERENCES 



" Determinations of Nitrogen in the Soils of some of the Experimental 

 Fields at Rothamsted, and the bearing of the results on the question of 

 the sources of the Nitrogen of our Crops." American Association for 

 the Advancement of Science Montreal, August, 1882. R. Mem., 

 Vol. V., No. 19. 



" On Some Points in the Composition of Soils ; with Results illustrating 

 the Sources of the Fertility of Manitoba Prairie Soils." Full Paper, 

 Trans. Chem. Soc., 47 (1885), 380. R. Mem., Vol. 'VI., No. 4. 



" On the Present Position of the Question of the Sources of the Nitrogen of 

 Vegetation, etc. etc." Phil. Trans., 180, B (1889), 1. R. Mem., 

 Vol. I. (4to), No. 2. 



"On the Analytical Determination of Probably Available 'Mineral' Plant 

 Food in Soils," by B. Dyer, D.Sc. Trans. Chem. Soc., 65 (1894), 1 15. 



"Results of Investigations on the Rothamsted Soils, etc., etc.," by B. 

 Dyer, D.Sc. Bulletin No. 106, Office of Experiment Stations, U.S. 

 Department of Agriculture, 1902. 



"A Chemical Study of the Phosphoric Acid and Potash Contents of the 

 Wheat Soils of Broadbalk Field, Rothamsted," by B. Dyer, D.Sc. 

 Phil. Trans., 194, B (1901), 235. 



" The Determinations of Available Plant Food in Soils by the use of weak 

 Acid Solvents," by A. D. Hall, and F. J. Flymen. Trans. Chem. Soc., 

 81 (1902), 117. 



"The Geological Survey in Reference to Agriculture; with Report on the 

 Soils and Subsoils of the Rothamsted Estate," by Horace Woodward, 

 F.R.S. Summary of Progress of the Geological Survey for 1903, 

 Appendix I. (1904), 143. 



"The Mechanical Analysis of Soils and the Composition of the Fractions 

 resulting therefrom," by A. D. Hall. Trans. Chem. Soc., 85 (1904), 

 950. 



"The Effect of the long-continued use of Sodium Nitrate on the Constitu- 

 tion of the Soil," by A. D, Hall. Trans. Chem. Soc., 85 (1904), 964. 



