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Averaged plant heights (X ± SD; n = 15 per treatment) of Alnus glutinosa cultivated on noninoculated, nonamended soil (○); noninoculated soil amended with 1% A. glutinosa leaf litter (●); nonamended soil inoculated with Frankia strains AgB1.9, ArI3, and Ag45/Mut15 each at an estimated density of 107 cells g of soil−1 (dry weight) (□); and inoculated, amended soil (▪).
