114 



Forestry Quarterly. 



YIELD TABLE, NORWAY SPRUCE (Picea excelsa) 

 SITE l-V 

 CUBIC FEET PKR ACRE 



Max. 



286 

 543 

 787 

 1115 

 1430 

 1788 

 2145 

 2531 

 2903 

 3289 

 3661 

 4047 

 4419 

 4791 

 5148 

 14,000 

 5491 

 5820 

 6135 

 6435 



T 

 Aver. 



148 



243 



329 



443 



543 



672 



772 



887 



987 



1101 



1287 



1287 



1387 



1487 



1573 



Max. 



216 



372 



515 



701 



872 



1058 



1230 



1401 



1673 



1746 



1902 



2059 



2217 



2374 



2517 



Dr. Borgmann concludes: 



(i) That the yield investigations conducted by the German 

 Experiment Stations are scientifically accurate. 



(2) The data in recent yield tables furnish an invaluable 

 basis for deciding questions of practical management aside from 

 their obvious value in determining the volume and increment of 

 individual stands. 



(3) Yield tables are especially useful in 



(a) Forest Organization: as basis for choice of species and 

 method of management; for deciding upon the most favorable 

 rotation age as well as for judgment site and stand quality; 

 especially for the estimate of the volume and increment of in- 

 dividual stands. 



(b) Forest Valuation: e.g. in damage calculations. 



(c) Forest Statics: e.g. in determining the most advantageous 

 degree of intensity in thinnings ; in the ascertaining of value 

 increment. 



(4) Continued investigations of the yield according to classes 

 of product and a closer relation with wood technology is to 

 be desired. 



"Wie sind die Brgebnisse der neuren forstlichen Brtragsuntersuchungen 

 tuich ihrem ivissenschaftlichen und praktischen W'crt su heurteilen?^' All- 

 gemeine Forst- und Jagd-zeitung, December, 1913, pp. 397-412. 



