Abstract
A series of fourteen Pacific North-west Douglas-fir installations, ranging in age from 6 to 26 years were analysed with respect to site factors, foliage nutrients, and growth response to applied fertilizer. Unfertilized basal area increment ranged from 1.2 to 3.1 m2 ha−1 yr−1 with no apparent relationship with soil, stand age or site index. Basal area increment was correlated with foliage N and a critical level for N was calculated as 1.7%. Applications of 220 kg N ha−1 as urea increased growth between 0 and 95% of the unfertilized basal area growth, with an average of 24.9%. Response could be predicted from foliage N and unfertilized basal area increment. When the same relationships were applied to previously older stand data, results were more variable as elements such as B and S showed evidence of being limiting.
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References
Atkinson WA and Morison IG (1975) The Pacific Northwest Regional Fertilization Project, an integrated approach to forest nutrition research. In: Bernier and Winget CH (eds.) Forest Soils and Forest Land Management p. 477–489. Fourth North American Forest Soils Conference, Quebec, 1973.
Epstein E (1972) Mineral nutrition of plants: principles and perspectives. N.Y.: John Wiley and Sons.
Kelly J and Lambert MJ (1972) The relationship between sulphur and nitrogen in the foliage ofPinus radiata. Plant Soil 37: 395–408
Lambert MJ (1975) Methods for chemical analysis. For Comm NSW Tech Bull 25
Lambert MJ and Turner J (1977) Dieback in high site qualityPinus radiata stands in the role of sulphur and boron deficiencies. NZ J For Sci 7: 333–348
Shumway J and Atkinson WA (1978) Predicting nitrogen fertilizer response in unthinned stands of Douglas-fir. Commun Soil Sci Plant Anal 9: 529–539
Sokal RR and Rohlf FJ (1969) Biometry — the principle and practice of statistics in biological research. WA Freeman and Co, San Francisco.
Turner J (1975) Nutrient cycling in a Douglas-fir ecosystem with respect to age and nutrient status. PhD thesis, University of Washington, Seattle
Turner J and Lambert MJ (1978) Sulphur nutrition of conifers in relation to response to fertilizer nitrogen, to fungal infections and to soil parent materials. Proceedings Fifth North American Forest Soils Conference. Aug 6–9 1978, Colorado US
Turner J and Olson P (1976) Nitrogen relations in a Douglas-fir plantation. Ann Bot 40: 1185–1193
Turner J, Lambert MJ and Gessel SP (1977) Use of foliage sulphate concentrations to predict responses to urea application by Douglas-fir. Can J For Res 7: 476–480
Turner J, Lambert MJ and Gessel SP (1979) Sulphur requirements of nitrogen fertilized Douglas-fir. For Sci 25: 461–467
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Turner, J., Lambert, M.J. & Gessel, S.P. Nitrogen requirements in young Douglas-fir of the Pacific North-west. Fertilizer Research 15, 173–179 (1988). https://doi.org/10.1007/BF01050679
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DOI: https://doi.org/10.1007/BF01050679