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Agronomy Journal Abstract -

Allelopathy in Forage Crop Systems


This article in AJ

  1. Vol. 88 No. 6, p. 854-859
    Received: Dec 22, 1994

    * Corresponding author(s): damiller@uiuc.edu
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  1. Darrell A. Miller 
  1. Dep. of Crop Sciences, Univ. of Illinois at Urbana-Champaign, 1102 S. Goodwin Ave., Urbana, IL 61801. Exp. Stn. Project 1-6-55179.



Secondary plant metaholites and their degradation products are important in all agroecosystems including those with forage crops. Allelopathy affects cropping systems and interseeding of one species into established sods of another. Autotoxicity and heterotoxicity are types of allelopathy. Alfalfa (Medicago sativa L.) has been investigated as both an autotoxic and heterotoxic species. Reestablishment of alfalfa immediately after alfalfa has usually resulted in poor stands due to autotoxicity, and several other forage species also exhibit autotoxicity. Many forage species have shown heterotoxicity, both between forage species and weed species. Several investigators have identified various allelochemicals and/or families of allelochemicals as being responsible for allelopathic reactions. Identifying such chemicals would aid in developing resistant forage cultivars and in maintaining a productive and profitable crop. Crop rotation, cover-crop management, interplanting, double cropping, no-till planting, and nonrotational cropping systems are involved with allelopathic effects. Some alfalfa cultivars possess some resistance to these allelochemicals. Therefore, a breeding program could provide resistant germplasms. Various forage grasses and some weed species have demonstrated allelopathic effects on alfalfa, and alfalfa has allelopathic effects on some weed species. This alone may provide an insight for herbicide studies in alfalfa production.

Presented at a symposium, Allelopathy in Cropping Systems (jointly sponsored by Div. C-3, C-2, S-6, and S-8), at the ASA-CSSA-SSSA annual meetings in Seattle, WA, 14 Nov. 1994.

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