REFORESTATION ON THE NATIONAL FOBESTS. 



33 



With a suitable area well prepared, the amount of seed of the 

 more important species required per acre is about that shown in 

 Table 6. The amounts are based on the average germination per 

 cent given in Table 5. These quantities should be varied, as germina- 

 tion tests differ from those shown in this table or as spacings of 

 seed spots differ. 



Table 6. — Number of seed required per acre. 



BROADCAST SOWING OVER THE WHOLE AREA. 



Species. 



Western red cedar 



Douglas fir 



Amabilis fir 



Grand fir 



Noble fir 



Red fir 



Austrian pine 



Jeffrey pine 



Lodgepole pine — 

 Maritime pine 



Seed per 

 acre. 



Pounds. 

 1J-2J 

 4- 5 

 8-10 

 8-10 

 8-10 

 8-10 

 8-10 



18-24 

 2- 3 



10-20 



Mexican white pine . 



Norway pine 



Scotch pme 



Sugar pine 



Western white pine . 

 Western yellow pine 



White pine 



Engelmann spruce . . 



Norway spruce 



Sitka spruce 



Seed per 

 acre. 



Pounds. 

 8-10 

 4 



7- 8 

 10-20 

 8-10 

 6- 8 

 8-10 

 2- 4 

 5- 7 

 2- 3 



SEED-SPOT SOWING. 

 [Spots spaced 7 by 8 feet; approximately 10 to 12 goodi seed per spot.] 



Bigtree 



Western red cedar. 

 Arizona cypress . . . 



Douglas fir 



Amabilis fir 



Grand fir 



Noble fir 



Red fir 



Austrian pine 



Jeffrey pine 



Lodgepole pine 



Maritime pine 



Mexican white pine. . 



Norway pine 



Scotch pine 



Sugar pine 



Western white pine . . 

 Western yellow pine . 



White pine 



Engelmann spruce . . . 



Norway spruce 



Sitka spruce 



> For example, if the germination tests showed 50 per cent germination, 24 seed would have to be sown 

 to have 12 good seed. 



A standard stocking of about 800 trees per acre has been adopted 

 for nearly all of the planting operations on National Forests. This 

 stocking is undoubtedly not the most desirable for all species or 

 sites, but is considered the best to adopt as a general standard. As 

 more becomes known about the various species, different spacings 

 will doubtless prove more suitable. Uniform stocking has the ad- 

 vantage of facilitating calculations and making comparisons of 

 different planting operations. As a matter of fact, because of the 

 roughness of the country, the rocks, logs, and brush on the plant- 

 ing areas, uniformity in stocking is not attained. The number of 

 trees planted per acre varies from 600 to 1,000 or more. 



COSTS. 



The elements which have a material bearing upon the cost of 

 sowing or planting are many, and are sometimes unforeseen. The 



