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NITROGEN FERTILIZER INCREASES GRbwrH . OF-DOUGLAS-FIR IN ' :-(' ::"!
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SOUTHWEST OREGON " '; : ;."... ;"�""J'�:"";,-:::�';;..�y',:,,.-! -., '- ;- '. ': :--'<;,:-:.:t
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"<'';':: ? ' Data from 'studies 1n southwest' Oregon "demonstrate :::d--
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1991 . ''';''''
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Er;!: 17!��Sl::1� \�\�::E ;"r�:��� r::::; :: .
over a range of site cond itions, - we assembled data on ;;}:j.
tree growth and site characteristics from 130 fertili­ .'. "
'zer trials (totaling 730 plots) located west of the >:,·
. Cascade Crest,' south of Salem, ''Oregan and into northern ':t: : +
California.
About 70 percent of these ';trials were "'':
estab 1 ished by the cooperative Regiona 1 Forest Nutri - :;: ' ,
'ticn Research Project adfl1inistered by the University of . :: -::
Washington.. .The balance were estab1 ished by the USDA ,; - ,Forest Service, USDI Bureau of Land Management. forest --)-\7
"industry,"'" or '"Oregon State .University., '.·f.Time· since .;�.:..
fertilization ranged from 5 o 14' yea·rs . ·!.:These tria 1 s .:·t. .
are located in ' stands that' range from :10 through 100 -:',
years old and from Site 1 through V. 'but are not unifonnly distributed across all combinations of age and ;::':
site classes. 'Thus, we caution that this' nonunifonn . ;,;:'.J'
sampling wi11 reduce the. accuracy 'of our .predictions. . ·.':/r·,'·
. . �} :1t::· ·?t:: :'..";! .:; �� . : . .:" ',:: ; .:;' #¢. t;:" ,;; :2: if: .: :' · · : i .!·;/ ::' ! . . '.". ... i' "..:: : .
·< .·Our .current analyses 'fn the Douglas:'fir ,type (80 ....
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percent or more of initial basal area as'that species)
. .
indicate that a single application of 200 lbs of N/acre
as urea increased gross volume growth (net growth +
:
mortality losses) by about 500 cubic feet averaged
across all sites over an eight year period. ·.These ini­
tial analyses also show that more volume 'was gained
from fertilizing thinned stands than nthinned stands.
'
'
:- M ' extensive'" nal
a :' n
\o' clarify
the interactions with site quality thinning. and age.
By adding site-describing variables we anticipate hav­
ing more site-specific estimates than those bas'ed now
on site index. age. and thinning For more infonnation
contact us at the Forestry Science Laboratory. 3625
: ...
.93rd
.
. Avenue SW, Olympia. WA. 98502, (206)753-9470.
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Gary Clendenen, PNW '.
Dave Bruce, PN (retired) .
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Soil moisture measurements around madrone in the
isolated F and C plots did not show distinct moisture.
This is likely an
depletion at the 30 or 60 cm depths.
artifact of vegetation clearing coupled with too short
of a duration between plot clearing and measurement.
But. other evidence indicates that madrone grows a deep
tap-root, .and may not be dependent on soil moisture at
these shallower depths.
Tho tr n nirrltinn behavior
of
t he herbicide treat-
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LOGGING METHODS AFFECT SEEDLING SURVIVAL
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Preliminary data describing damage to underst o ry
conifers are now available from a Fund ame ntal FIR study
(FIR REPORT 4(3):4) that 1s looking at the costs and
effectiveness of savi understory reQeneration during
.
.