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Licorice seedling performance under distinct inoculants and exogenous glycyrrhizin addition. I, initial sampling stage; A, allelochemical treatment; W, water treatment; C, control: no inoculants, N, Novosphingobium resinovorum inoculants; E, Ensifer sesbaniae inoculants; S, synthetic inoculants. The upper and lower plants represented single and clustered seedlings at the same sampling stage, respectively
