EROSION AND PLANT GROWTH 



^85 



that throughout the experiment the average moisture content 

 was about 30 per cent, an amount ample to produce vigorous 

 growth on both soil types. ^ 



The two following tables and Figures 59 and 60 summarize 

 the results as to the vegetative growth and the water require- 



{Forest Service, stnder direction of the Author.) 

 Fig. s9— the meaning OF SOIL EROSION. 

 Canadian field peas {left) grown in poor or eroded soil, and (rishl) grown in good mellow soil of the 

 same type which had not been subjected to erosion. 



1 Sampson, Arthur W., and Weyl, Leon H., "Range Preservation and its Re- 

 lation to Erosion Control on Western Grazing Lands." U. S. Dept. of Agr. Bui. 

 675, pp. 18, 19, 1918. 



