Original scientific paper
THE EFFECT OF SEED PROCESSING AND DENSITY OF SOWING ON THE NUMBER OF PLANTS OF AUSTRIAN PINE (PINUS NIGRA J.F. ARN.)
Valentin Roth
; Forest Research Institute, Jastrebarsko
Tomislav Dubravac
; Forest Research Institute, Jastrebarsko
Ivan Pilaš
; Forest Research Institute, Jastrebarsko
Abstract
The investigation used Austrian pine seed originating from the clonal seed orchard
"Prkos" (unacknowledged), Forest Administration Branch Office Gospi}, Forest Office
Gospi} (crop 2001), processed during the winter of 2001/2002 in the seed extraction plant
of the Jastrebarsko Forest Research Institute (ROTH 2002).
Furthermore, by sowing based on the formula "1" (X=number of seed/m2) 40% to 45%
of the desired number of plants can be obtained (desired number "A", Table 3). While sowing
the seed amount according to the formula "2" (N = amount of seed in g/m2) 3.5 times
more Austrian pine plants were obtained than the desired number (desired number "V").
By certain changes in the existing formulae for calculating the necessary amount of
seed for the desired number of plants greater accuracy would be achieved, which was confirmed
in these investigations with seed of Austrian pine.
Such investigations should be carried out with the same species in several nurseries, because
in the formula for calculating the number of seed for sowing the soil factor is not specifically
emphasised.
Keywords
Austrian pine (Pinus nigra J. F. Arn.); seed processing; sowing density
Hrčak ID:
26016
URI
Publication date:
24.9.2006.
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