40 -1 



Seed spacing 

 Oyjord seeder 



10 20 30 40 50 60 70 80 90 100+ 

 Distance between seeds (mm) 



Seedling spacing 

 Oyjord seeder 



10 20 30 40 50 60 70 80 90 100+ 

 Distance between seedlings (mm) 



40 



30 



c 



Q) 

 O 



q5 20 



CL 



10 - 



Seed spacing 

 Summit Precision seeder 



[Xll>g]l>gl 



g I ^ "I " ^■' i ^ ' ^ ^r^' . r -.T i T i. r -..-,-. 1 ^ , 1 , p 



10 20 30 40 50 60 70 80 90 100+ 

 Distance between seeds (mm) 



40 n 



30 



c 



0} 



o 



0) 20 



10 



Seedling spacing 

 Summit Precision seeder 



T 1 1 r 



10 20 30 40 50 60 70 80 90 100+ 



Distance between seedlings (mm) 



Figure 3a — Spacing distribution 

 histograms for Douglas-fir seeds and 

 seedlings from 95 percent germination 

 seedlots at the J. Herbert Stone Nursery. 



Seedling spacing 

 Hand thinned 



10 20 30 40 50 60 70 80 90 100+ 

 Distance between seedlings (mm) 



13 



