Å UMARSKI LIST 9-10/1967

Tabela 10
Postoci rentabilnosti po šumsko-uredajnim đebljinskim stepenima
šumsko-uređajni
debljinski 22,5 27,5 32,5 37,5 42,5 47,5 52,5 57,5 62,5 67,5 72,5 77,5 82,5 87,5
stepeni — cm
Postoci
rentabilnosti —12,88 16,40 35,29 48,00 57,04 63,60 68,37 71,93 74,02 75,09 74,65 73,60 72,22 70,43
Kako se iz podataka prikazanih u tabeli 10 i na slici 8 vidi najrentabilniji
šumsko-uređajni debljinski stepen jele (Abies alba Mill.) za pilansku preradu
je debljinski stepen od 67,5 cm, a šumsko-uređajni debljinski stepen od 27,5
cm predstavlja prag rentabilnosti pri pilanskoj preradi.
Pilanski trupci izrađeni iz jelovih stabala koja na temelju prsnog promjera
pripadaju šumsko-uređajnom debljinskom stepenu od 22,5 cm ne rentiraju se
za pilansku preradu u jugoslavenskim uvjetima proizvodnje i načina prerade.
AN INVESTIGATION INTO THE MOST PROFITABLE MANAGEMENT
DIAMETER SUB-CLAS OF SILVER FIR (Abies alba Mill.)
FOR SAWMILL CONVERSION
Summary
In Yugoslavia Silver Fir (Abies alba Mill.) is an autochthonous forest tree
species and to the technological process of Firwood conversion.
Yugoslav specialists ascribe a specific importance to investigations of the Fir
species and to the technological process of Firwood conversion.
In Tables 1 and 2 is given the number of Fir trees and the number of sawlogs
distributed over management diameter sub-classes taken into consideration for these
investigations. From the Tables it is visible that we had at our disposal 14 management
diameter sub-classes of 5 cm. width (from 22.5 to 87.5 cm.).
In Tables 3 and 4 is represented the quality structure of Fir sawlogs in total
and according to the management diameter sub-classes.
In Table 5 is shown the percentage of utilization of Fir logs in the sawmill.
This percentage increases with the higher management sub-classes.
In the management sub-class of 22.5 cm. the utilization percentage in the sawmill
amounts to 72.90, and in the sub-class of 87.5 cm to 77.00.
In Table 6 is represented the quality structure of Fir sawn timber according
to the management sub-classes, and in Table 7 the mean quality numbers (average
values) per 1 cu.m. of Fir sawn timber.
The mean quality numbers are the function of the quality and the unit (limited)
prices per 1 cu.m. of Fir sawn timber. They increase with the higher management
diameter sub-classes and culminate in the 62.5 and 67.5 cm. diameter sub-classes,
after which they display a tcdcncy of slow decrease.
In table 8 are presented the cost prices per 1 cu.m. and management diameter
sub-classes calculated on the ground of the basic-technological time (in the process
of production) which was measured and statistically processed.
The highest cost price per 1 cu.m. of Fir sawn timber is in the 22.5 cm. management
diameter sub-class, and it amounts_ to 33,793 old dinars, and the smallest
in the 67.5 cm. diameter sub-class, where it amounts to 17,477 old dinars per 1 cu.m.
of Fir sawn timber.
In Table 9 is presented the profit per 1 cu.m. of Fir sawn timber and by the
management diameter sub-classes. The highest profit is yielded by the 67.5 cm.
management diameter sub-class, and it amounts to 13,123 old dinars.
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