494 



EXPERIMENTS IN THINNINGS. 



C. Unthinned area. 



Timber. Smalhvood. Total. 



0-0 96-10 96-10 



Standing stock at 19 years 



Windfalls 



Deadwood 



Standing stock at 40 years 



Increase since the age of 19 years ... 179*26 39*64 218*90 



Experiment III. 



Experiment made on a tuft plantation, on square pattern, of 

 spruce 22 years old, leaf-canopy complete, growth in height and 

 thickness vigorous. Five thinnings at intervals of 5 years. 



A. Heavily thinned area. 



Standing stock at 22 years 



Yield of Windfalls 

 Thinnings 

 Standing stock at 42 years 



... 119-43 



... 10-72 



... 48-18 

 . 304-90 



78-05 



3-80 

 27-45 

 91-17 



197-48 



14-52 



75-63 



396-07 



Total production up to 42 years ...363*80 122*42 486*22 

 Increase since the age of 22 years ... 244*37 44*37 288*74 



J3. Moderately thinned area. 



108-76 



74-84 



183-60 



Standing stock at 22 years 



Yield of Windfalls 

 Thinnings 

 Standing stock at 42 years 



Total production up to 42 years ... 327*54 



Increase since the age of 22 years ... 218-78 52*53 271*31 



