o/o o/o /o /o o/o o/o o/b FEET 



^- GROUND WATER 



FIG. 43 



Soil section showing downward growth of roots to 21 feet, and percentages of various plant 

 foods at different depths. As the drawing and tables were obtained from different sources, the 

 percentages do not indicate those in the soil in the drawing, but are composite percentages from 

 analyses of different soils. 



48 



