Young true fir trees response to nitrogen fertilization in western Washington and Oregon

Forest fertilization has been successful in Douglas fir [Pseudotsuga menziesii (Mirbel) Franco] stands in the Pacific Northwest, but little information is available on fertilizer responses of true firs in the northwestern USA. This study was initiated to evaluate the effects of fertilizer treatments...

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Bibliographic Details
Published inSoil Science Society of America journal Vol. 57; no. 3
Main Authors Chappell, H.N, Bennett, W.S
Format Journal Article
LanguageEnglish
Published 01.05.1993
Subjects
ABIES AMABILIS
ABIES PROCERA
ABONOS DE OLIGOELEMENTOS
AZUFRE
CHLORURE DE POTASSIUM
CLORURO POTASICO
CONTENIDO DE NITROGENO
CRECIMIENTO
CROISSANCE
DOSE D'APPLICATION
DOSIS DE APLICACION
ENGRAIS A OLIGOELEMENTS
FEUILLE
FOSFATO DICALCICO
FOSFORO
HOJAS
MAGNESIO
MAGNESIUM
NITRATE D'AMMONIUM
NITRATO DE AMONIO
OREGON
PESO
PHOSPHATE DICALCIQUE
PHOSPHORE
PINUS
POIDS
SOUFRE
SULFATE
SULFATOS
TENEUR EN AZOTE
UREA
UREE
WASHINGTON
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Summary:Forest fertilization has been successful in Douglas fir [Pseudotsuga menziesii (Mirbel) Franco] stands in the Pacific Northwest, but little information is available on fertilizer responses of true firs in the northwestern USA. This study was initiated to evaluate the effects of fertilizer treatments in young managed stands of true firs across a range of sites. Single-tree fertilization screening trials were established in 22 young stands of noble fir (Abies procera Rehder) and Pacific silver fir (A. amabilis Dougl. ex J. Forbes) in the Pacific silver fir zone in western Washington and Oregon. Fertilizer treatments included N applied at rates of 224 and 448 kg N ha-1 as NH4NO3 and urea, alone and in combination with P, S, and micronutrients. Unit needle weights and foliar N and P concentrations were determined after one growing season, and tree growth was measured for 4 yr. First year foliar N concentrations and needle mass and 4-yr tree basal area growth was significantly greater (P = 0.05) for all fertilizer treatments than for controls for both species. Significant increases in foliage mass and nutrient content indicate that growth increases due to added N are likely to continue for several more years. Further work is needed to extend favorable results from these single-tree trials to stand-level response estimates
Bibliography:F61
F04
9430107
K01
ISSN:0361-5995
1435-0661
DOI:10.2136/sssaj1993.03615995005700030033x