Abstract
Container-grown Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) and ponderosa pine (Pinusponderosa Dougl. ex Laws.) were inoculated with the ectomycorrhizal fungus Laccarialaccata (Scop, ex Fr.) Berk, and Br. and grown under three levels of soluble fertilizer (low, high, and a combination of low changed to high) and full and half strength of a slow-release fertilizer. Ectomycorrhiza development was excellent for both hosts regardless of fertilizer treatment; percent ectomycorrhizal short roots averaged 93.6 for Douglas-fir and 94.5 for ponderosa pine. Inoculation did not affect the size of Douglas-fir but significantly reduced growth of ponderosa pine under low fertility. L. laccata performed well under high-fertility regimes; production of outplantable nursery stock with well-developed ectomycorrhizae was obtained.
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