30000 



SITE INDEX 



10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 



AGE 



Figure 29 — Grand fir yield curves for untfiinned plantations in Inland Northwest 

 forests (total cubic feet all stems). 



SITE INDEX 



10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 



AGE 



Figure 30 — Grand fir yield curves for unthinned plantations in Inland Northwest 

 forests (merchantable cubic feet, 4.5-inch top, stems greater than 7 inches d.b.h.). 



30 



