Fig. 5 Spatio-temporal variation in soil juglone in a black walnut–corn alley cropping system. Juglone was quantified at 0, 0.9, 2.45, and 4.25 m (0 m represents the tree row and 4.25 m represents the middle of alley). Reproduced with permission from Kluwer Academic Press (Jose and Gillespie, 1998)

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