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Application. The nutrient regime recommended by the British Forestry Commission for rearing conifer seedlings in containers with solid, controlled-release fertilizers was not conducive to the formation of ectomycorrhizae on containerized Sitka spruce seedlings, either through inoculation with known symbionts or by naturally occurring ectomycorrhizal fungi. These results and those from a previous study indicate that containerized Sitka spruce seedlings of an acceptable size for outplanting and with a high proportion of their short roots colonized by the desired ectomycorrhizai symbiont can be obtained within a single growing season by using a weekly application of approximately 6.1 g per m 2 of bench space of a soluble 19-19-19 (N-P-K) liquid fertilizer.Abstract. Effects of low, medium, and high applications of solid, controlled-release fertilizers on ectomycorrhizal formation of containerized Sitka spruce (Picea sitchensis (Bong.) CarL) seedlings with a nursery or forest isolate of either Thelephora terrestris (Ehrh.) Fr., Laccaria laccata (Scop. ex Fr.) Cooke, or the "E-strain" fungus was evaluated 14 weeks after inoculation. The influence of fungal species and isolate source on seedling growth and nutrient status was also evaluated through an analysis of variance. Seedlings receiving the low level of fertilization were significantly smaller than those receiving the medium or high level. Fungal species and isolate source did not affect seedling size and was significant only for the percentage of short roots colonized which tended to be highest in the low fertilizer treatment. Analyses of foliage revealed that concentrations of nitrogen and phosphorus did not differ significantly by fertilizer level or fungal type whereas potassium was significantly higher at the low level of fertilization and magnesium was significantly lower at the low level of fertilization.

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