192 



THE PRINCIPLES OF SOIL MANAGEMENT 



are the result of coarse texture or of a loose, cloddy 

 structure, the final result is the loss of water. The fol- 

 lowing table shows the average results of the Rothamsted 

 drain gages for thirty-four years, by months from 1871 

 to 1904, on a rather heavy loam or clay loam soil, and 

 twenty, forty and sixty inches in depth. These gages 

 have an area of one thousandth of an acre each, and are 

 kept free from vegetation. 



Table XXXVI 



January 



February 



March 



April 



May 



June 



July 



August 



September .... 



October 



November 



December 



Mean total per 

 year 



Maximum . 

 Minimum . 



Rain- 

 fall 



Drainage through 

 soil 



20 



40 



60 



Depth in inches 



Proportion of rainfall 

 drained through soil 



20 



40 



60 



Per cent 



2.32 

 1.97 

 1.83 

 1.89 

 2.11 

 2.36 

 2.73 

 2.67 

 2.52 

 3.20 

 2.86 

 2.52 



28.98 



84.5 

 75.2 

 52.0 

 28.0 

 23.6 

 26.3 

 23.8 

 21.7 

 30.0 

 52.5 

 72.4 

 81.0 



48.0 



Results for maximum and minimum rainfall 



63.0 

 37.6 



