INFLUENCE OF THINNINGS 



On Quality I Soil. Where thinnings are possible the costs may be 

 reduced by utilizing thinnings about the 30th, 40th, and 50th years. 

 Other studies by the writer, based on number, volume, size, etc., of trees 

 per acre shown by Forest Service yield tables, would seem to indicate 

 pretty clearly that on Quality I soil, timber of at least the values in- 

 dicated in Table VII, may be removed in thinnings where they are util- 

 izable. There is furthermore very little doubt that all thinnings from 

 young stands originated now or hereafter may be utilized because even 

 now demands for pulpwood, ties, and mine timbers are capable of using 

 all of this type of timber within easy reach of transportation. 



Tables VII, VIII, and IX show possible deductions from cost due to 

 this source of income, but the data along this line are not as reliable as 

 other cost data because of uncertainty as to the future price of wood. 



TABLE V. 



Estimated average costs per acre and per M. ft. B. M. of growing Douglas 

 fir on Quality III, or poorest quality, forest soil under a 60 year rotation, 

 computed for interest rates securable by various classes of owners. 



Compound interest on cost 



of stocking 24 . 46 



Sum of annual charges for 



administration 12.00 



Compound interest on all 

 amounts spent for ad- 

 ministration and pro- 

 tection from time in- 

 curred to time of cut- 

 ting 20.61 



Taxes under general prop- 

 erty tax when owner 

 is subject to them 



Compound interest on 



taxes 



Taxes under 25% yield tax. 



Final product *23 . 95 



47.60 65.14 88.40 159.94 284.74 

 12.00 12.00 12.00 12.00 12.00 



35.60 45.90 58.71 94.62 150.71 



**14.33 **14.33 **14.33 



**17.35 **25.80 **38.14 



*39.74 *51.36 



Total cost per acre ..$ 95.80 $158.97 $205.45 $231.15 $375.65 $618.82 



Total cost per M. on basis 

 of yield, per acre, in 

 60 years, 16,500 ft. B. M.$ 5.80 



$ 9.64 $ 12.45 $ 14.01 $ 22.77 $ 37.50 



*See footnote (**), Table I. 



**As stated on page 23 the value of the yield on Quality III, or poorest 

 quality forest soil, will not be more than one-third that on Quality I soil, 

 hence the taxes under general property tax may be assumed to be only one- 

 third as great. These figures for both taxes and interest thereon have, 

 therefore, been derived directly from corresponding values in Table I by 

 computing one-third of each value there given as the correct figure for this 

 table. 



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