Plant and Soil

, Volume 203, Issue 2, pp 191–197 | Cite as

Allelopathy in black walnut (Juglans nigra L.) alley cropping. I. Spatio-temporal variation in soil juglone in a black walnut–corn (Zea maysL.) alley cropping system in the midwestern USA

  • Shibu Jose
  • Andrew R. Gillespie


A study was conducted to quantify the spatial and temporal variation in soil juglone (5-hydroxy-1,4-naphthoquinone) in a 10-year-old black walnut (Juglans nigra L.)–corn (Zea mays L.) alley cropping system. Two treatments (‘root barrier’ and ‘no barrier’) were applied to determine if soil juglone in the alley can be minimized by preventing black walnut root growth into the alley. Although no significant seasonal variation in soil juglone existed, a distinct spatial pattern was observed. Juglone concentration decreased as much as 80% as the distance increased to 4.25 m from the tree row. Installation of polyethylene root barriers minimized juglone concentration to trace levels in the alley. However, this treatment increased juglone levels within the tree row as compared to the ‘no barrier’ treatment, probably as a result of increased rooting density within a limited volume of soil.

allelopathy alley cropping black walnut juglone 


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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Shibu Jose
    • 1
  • Andrew R. Gillespie
    • 1
  1. 1.Department of Forestry and Natural ResourcesPurdue UniversityWest LafayetteUSA

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