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A ley-farming system for marginal lands based upon a self-regenerating perennial pasture legume

  • Tom EdwardsEmail author
  • John Howieson
  • Brad Nutt
  • Ron Yates
  • Graham O’Hara
  • Ben-Erik Van Wyk
Review Article
  • 4 Downloads

Abstract

Annual-based farming systems represent some of the most highly disturbed terrestrial ecosystems on the planet. They are also highly exposed to climate variability. Many wheatbelt systems of southern Australia rotate annual crops with annual pastures, where the productivity of both is reliant upon seasonal rainfall. Perennial plants, in contrast, are less reliant upon both consistent rainfall and annual establishment, so one approach to decrease exposure to climate variability and disturbance in agriculture is to increase the proportion of the farm sown to perennial species. Perennial pasture or forage species offer immediate possibilities for transformation of agricultural ecosystems as they offer high protein feed to animals, often when green feed is most limiting, and concomitantly restore soil fertility. However, there are no perennial forage legumes adapted to acid and infertile soils in low-rainfall regions of the developed world, either in temperate or Mediterranean climates. Here, we review the recent research efforts to domesticate a perennial legume for these regions. Reasons for the lack of success are provided by a comparison of the attributes of the legumes evaluated in recent research programs and the limitations of these legumes as assessed by reviews and publications. This manuscript outlines an alternative approach to domestication of perennial forage legumes for acid soils and introduces new concepts in ley farming in an Australian context that might support the development of more sustainable agro-ecosystems. It highlights situations where very hard-seeded annual legumes have been successfully included in modern intensive cropping systems, and where perennial legumes may underpin ley-farming systems on infertile soils that normally produce low crop yields. Both innovations require the legume and their nodule bacteria to be sown only once in decades and address concerns about the sustainability of modern agro-ecosystems.

Keywords

Self-regenerating legumes Perennial Rhizobia Ley farming Agro-ecosystems Lebeckia ambigua 

Notes

Acknowledgments

We thank Ted Astbury, David Quartermaine and Richard Guinness who facilitated some of the trial work to be done on their farming properties. The contributions and technical expertise of Dr. Neil Ballard, Samantha Lubcke, Robert Harrison and Regina Carr are greatly appreciated. Professor Janet Sprent made comments on an early draft of the manuscript.

Funding

Partial funding was provided to the Lebeckia domestication program by ACIAR, the South West Catchment Council and Murdoch University, and this is gratefully acknowledged.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© INRA and Springer-Verlag France SAS, part of Springer Nature 2019

Authors and Affiliations

  • Tom Edwards
    • 1
    • 2
    Email author
  • John Howieson
    • 2
  • Brad Nutt
    • 2
  • Ron Yates
    • 1
    • 2
  • Graham O’Hara
    • 2
  • Ben-Erik Van Wyk
    • 3
  1. 1.Department of Primary Industries and Regional Development Western AustraliaSouth PerthAustralia
  2. 2.Centre for Rhizobium StudiesMurdoch UniversityMurdochAustralia
  3. 3.Department of Botany and Plant BiotechnologyUniversity of JohannesburgJohannesburgSouth Africa

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