Black Walnut Allelopathy: Implications for Intercropping

  • Shibu Jose
  • Eric Holzmueller


Black Walnut (Juglans nigra L.) produces the chemical juglone that has an allelopathic effect on some companion species in intercropped systems. Nevertheless, black walnut continues to be a popular planted species in alley cropping, silvopastoral, and mixed species systems. Recent advances in management techniques, including the use of polyethylene root barriers, trenching or disking, and planting and managing the companion species during the early establishment of black walnut, have proven to be effective in alleviating the allelopathic effects of juglone. While allelopathic interference is a reality in black walnut intercropped systems, management intervention may help sustain the production potential so that they become an economically viable option for landowners.


Allelopathic Effect Companion Species Silvopastoral System Black Walnut Intercropped System 
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Copyright information

© Springer Science+Business Media LLC 2008

Authors and Affiliations

  • Shibu Jose
    • 1
  • Eric Holzmueller
    • 1
  1. 1.School of Forest ResourcesUniversity of FloridaFloridaUSA

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