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Total root mass (g fresh mass, FW) of silver birch seedlings in different treatment combinations. Estimated marginal means with ±SE are presented as histograms that are divided into water content (g) and shares of fine and main roots (g DW). Root samples for the analysis were collected in late March 2003. Int., intact seedling; Def., defoliated seedling; Unfert., unfertilized seedling; Fert., fertilized seedling.
