184 



HARUYOSHI SAHO 



The soil is derived from serpentine covered with a layer of volcanic ash 

 over 10 cm deep. One thousand seedlings per hectare were planted, but 

 only 815 survive. The planting density is considered to be quite low 

 (4000/ha or 1620/acre is common) , consequently the volume is very poor 

 being only 19 m 3 in volume. Average diameter is only 8.9 cm and average 

 height is only 5.4 m. 



(5) Kobui , Hokkaido, where the initial test plantations was estab- 

 lished in 1933. Early growth was good, so planting was continued until 

 1954. The total area now planted is 118 ha. Examples of the growth in 

 these plantations is shown below, and in Figure 3 that shows the 1941 

 plantation. 



Average diameter at 

 Planting date Average height (m) breast height (cm) 



1939 

 1941 

 1942 



8.2 

 8.5 

 7.8 



13.4 

 15.0 

 14.1 





Figure 3. Pinus 

 pentaphylla planted in 

 1941 at Kobui in the 

 southern part of Hokkaido 



