Western hemlock growth responses to nitrogen fertilization is reviewed. Specifically, the effects of nitrogen source, nitrogen rate, other nutrient elements, stand thinning, stand age, and site influence are discussed. Studies of the response mechanism, limited to fertilizer effects on foliar nutrient concentrations and damage to roots and mycorrhizae are also reviewed. They offer general guidelines, but no site-specific recommendations. A number of new studies are proposed, based on this review. They include examinations of fertilization with different rates and sources of nitrogen and phosphorus, and investigations of fertilization effects on stem growth, foliar nutrient concentrations, rate of photosynthesis, production of foliage, branch extension, biomass allocation, and damage to roots and mycorrhizae. Also proposes is a comparison of the response to fertilization of hemlock and Douglas-fir in mixed stands.
FRDA Research Report 201 (1305 KB)
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Updated July 24, 2015