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Above- and below-ground growth of white spruce seedlings with roots divided into different substrates with or without controlled-release fertilizer

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Abstract

Thirty-two one-year-old white spruce (Picea glauca (Moench) Voss) seedlings were grown outdoors for one season in 35 L pots buried in the soil. The pots were vertically split in half. One compartment (mineral) was filled with loamy sand. The bottom of the other compartment (organic) was filled with 10 cm sand topped with 15 cm of organic substrates. Two seedling types (16 seedlings each), (i) polystyroblock-grown and (ii) peat-board grown with mechanical root pruning had their root systems split approximately in half into each of the vertical compartments. Controlled-release (26-12-6 N-P-K) fertilizer was added to one or to none (control) of the compartments. Above-ground growth was positively affected by fertilizer placed in either soil compartmnent. Nutrient content of the foliage was greater in fertilized than in unfertilized seedlings; N and P concentrations were significantly increased. Bud reflushing occurred frequently in fertilized seedlings. Unfertilized container-grown seedlings had the fewest roots in either soil compartment. Unfertilized mechanically-pruned seedlings had significantly greater root length, root surface area, and more root tips in mineral than in organic compartments. They also had more P in current-year leaves than did unfertilized container-grown seedlings. Fertilizer added to mineral compartments significantly affected root growth in these compartments only, whereas when added to organic compartments it affected root growth in both compartments. Root systems of the two seedling types were differently affected by fertilizer: in mechanically-pruned seedlings, the number of roots was reduced but their length and diameter increased; in container-grown seedlings, root proliferation was stimulated and this increased total root length and root surface area. Five ectomycorrhizal morphotypes were identified. E-strain was the most abundant. Except for Cenococcum, all morphotypes were present in nursery stock prior to planting. Changes in distribution of morphotypes after planting appeared related to root health condition rather than to applied fertilizer.

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Krasowski, M., Owens, J., Tackaberry, L. et al. Above- and below-ground growth of white spruce seedlings with roots divided into different substrates with or without controlled-release fertilizer. Plant and Soil 217, 131–143 (1999). https://doi.org/10.1023/A:1004604221074

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