FIELD CAPACITY 

 (B ■ HORIZON) 



2 4 6 8 10 12 14 16 18 



TIME AFTER CLEARCUTTING 

 (Years) 



Figure 2. — Response surfaces at extremes of field capacity ^ showing the relations 

 between imderstory production^ time after clearcutting , and percent sand. 



POTASSIUM P.P.M. 



2 4 6 8 10 12 14 16 18 



TIME AFTER CLEARCUTTING 

 (Years) 



Figure 3. — Response surfaces at extremes of potassium content, sheading the relations 

 between understory production, time after clearcutting, and percent sand. 



8 



