Skógræktarritið - 15.05.2001, Side 76

Ehrh.), Sitka spruce (Picea sitcfi-
ensis (Bong.) Carr.), Russian larch
(Larix sukaczewii Dylis.) and lodge-
pole pine (Pinus contorta Dougl.
Ex. Loud.), show different re-
sponses to the timing of applica-
tion?
The trial was established on
three locations in lune 1998, two
in S-Iceland and one in N-lce-
land. Due to high mortality in
pine and problems with water-
logged soils on the site in north-
ern Iceland, only the results from
birch and spruce at Markarfljóts-
aurar and Kollabær were used.
There was no statistical signi-
ficant difference between treat-
ments, i.e. timing of application,
as regards the survival of seed-
lings. Seedlings that received
fertilizer at time of planting were
taller, had greater diameter and
had greater annual shoot elonga-
tion than those receiving fertil-
izer at other times. The difference
was particularly with birch but
less pronounced with spruce.
Results for birch show that no
fertilization at all gives poorer
growth and diameter than any of
the other treatments that were
tested in the trial. Birch gave
larger growth response than
spruce, which partly may be ex-
plained by a generally poorer
response of slow-growing species
to fertilizer addition.
Allar Ijósmyndir teknar af höfundi.
HEIMILDIR
Ása L. Aradóttir og lárngerður
Grétarsdóttir 1995. Úttektirá
gróðursetningum til landgræðslu-
skóga. Fjölrit Rannsóknastöðvar
Skógræktar ríkisins, nr. 9. 36 pp.
Guðmundur Halldórsson 1994.
Ranablöllur. Skógræktarritið.
52-58.
Hreinn Óskarsson 2000. Hvenærá
að bera á? Tímasetning áburðar-
gjafa. Tilraun frá 1998. Lýsing og
niðurstöður eftir þrjú sumur. Rit
Mógilsár Rannsóknastöðvar
skógræktar nr. 1/2000. 28 s.
ISSN 1608-3687.
Hreinn Óskarsson, Aðalsteinn Sigur-
geirsson & Biarni Helgason 1997.
Áburðargjöf á nýgróðursetningar í
rýrum jarðvegi á Suðurlandi. I.
Niðurstöður eftir tvö sumur.
Skógræktarritið 1997. 42-59.
|ón Guðmundsson 1995. Áburðar-
gl'öf á birki í landgræðsluskóg-
rækt, tilraunaniðurstöður. Skóg-
ræktarritið. 129-135.
Little, R.C.; Milliken, G.A.; Stroup,
W.W. & Wolfinger, R.D. 1995.
SAS® System for Mixed Models, Cary,
NC: SAS Institute Inc., 1996.
633 bls.
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