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ŠUMARSKI LIST 1-3/1975 str. 55     <-- 55 -->        PDF

On the experimental plot a total of 34 clones were raised, of which 7 clones
were laid out in a block system with random distribution and 3 replications. The
remaining 27 clones were planted on the experimental plot without replication
and with an uneven number of ramets per clone.

The age of transplants at planting was 2/2. The planting was done into pits
60 cm in diameter, while the planting depth amounted to 60—70 cm. The spacing
of plants was 3 X 3 m. No working of the soil on the experimental plot was performed.
From the genetical aspect the clones belonged for the most part to White
Willow (Salix alba L.), and to hybrids of White Willow and Crack Willow (Salix
fragilis L.).

Observations and measurements in the clonal test were done during a 6-year
period, while the statistical processing of data — with respect to the volume
produced — was performed at the end of the 5th growing period, and that for
7 clones.

Maximum diameter and volmue increments were achieved in the 5th year of
the plantation age.

In two clones the height increment culminated in the 5th year, while in the
remaining ones in the 4th year.

The F-test — with respect to the achieved volume at the end of the 5th year

— gave highly signinficant differences. The best results were achieved by the clones,
which, according to their taxonomic relationship, were closest to White
Willow (Salix alba L.). The absolutely best results — in the sense of production
— were achieved by the White Willow clone MB25, totalling a growing-stock volume
of 106.65 m3/ha at the end of the 6th year, and a maximum annual increment
of 59.75 m´Vha. The poorest results were yielded by clone 110 (S. fragilis X
S. alba) with a total volume of 40.91 m3/ha, and a maximum annual increment of
15.26 m3/ha.
Considering that in this clonal test were represented clones belonging to 3
(Sava, Drava and Danube) provenances it ought to be stressed that the optimal
production was exhibited by the Drava provenance. On the other hand, they also
displayed the poorest adaptation faculties in the sense of survival. Local clone
V-40 (Salix alba L.) achieved an optimum balance between the survival and volume

The facts presented are indicative of a high specialization and genotypic variability
of arborescent Willows.