74 PRACTICAL FORESTRY IN 



$2.00 to $5.00 per acre. Upon this basis the total cost per 

 acre will approximate the figures given in the table below : 



Broadcast over Seedspots, 



Species. entire area. Strips. 6' apart. 



Douglas fir' J3.20-4.75 f 1. 60-2.00 $2.75-6.00 



Yellow pine 5.20-6.25 1.85-2.35 2.75-6.00 



Western white pine 4.70-0.23 2.00-2.40 2.75-0.00 



KATE OF GROWTH AND PROBABLE RETURNS 



Of all factors in calculating the financial possibilities of 

 second forest crops, the growth to be expected is the easiest 

 to determine with fair accuracy. Future stumpage value, tax 

 burden and fire risk are all subject to uncertain influences, 

 but the approximate yield of a given species under given 

 natural conditions will be the same in the future that it is 

 now. To predict it requires only study of existing stands 

 without being misled by the influence of conditions which 

 will not be repeated. 



On the other hand, an immense amount of misinformation 

 is circulated because of superficial' observation. Enthusiasts 

 discovering individual trees which have made prodigious 

 growth, or even fairly extensive stands on fertile soil with 

 heavy rainfall, will compute sawlog yields at 40 or 50 years 

 which are much too optimistic for general application. Others, 

 remembering some stand they have seen in unfavorable locali- 

 ties, or noting shade-suppressed trees which will not be paral- 

 leled after the virgin forest is removed, are unduly discour- 

 aged. It is most essential that yield tables be made by trained 

 observers who know how to reach the true average, and that 

 the figures either actually come from the region to which 

 they are to be applied or are accompanied by a systematic 

 analysis of climatic and other conditions which permits in- 

 telligent comparison. 



In calculating another yield on cut-over land, the system 

 for an even-aged new growth, such as will follow clean cut- 

 ting of Douglas fir, for example, is quite different from that 



