Weed suppressive potential of selected pasture legumes against annual weeds in southeastern Australia

Research output: Book chapter/Published conference paperConference paperpeer-review

Abstract

Poor adaptation of numerous annual and perennial legumes across south eastern Australia due to acidic soils, insufficient rainfall resulting in false breaks, high input costs, soil acidification and the emergence of herbicide resistant weeds have resulted in limited options for producers seeking to establish productive pastures in the Riverina region of New South Wales (NSW). To overcome these challenges, numerous novel pasture species have been selected and recently released for establishment. However, limited knowledge exists regarding their ability to suppress weeds during establishment and in subsequent years when they regenerate. Field trials were conducted at Wagga Wagga, NSW over a two year period to evaluate: (a) the suppressive potential of eight selected pasture legumes against annual weeds; and (b) the impact of autumn (March) and winter (June) sowing dates on stand establishment. Weed and crop cover and biomass were assessed each year in replicated trials in 2016–2017. Results suggested that species mixtures with more than one pasture species were not significantly different (P<0.05) in terms of establishment and subsequent weed infestation. However, autumn sowing of arrowleaf clover, yellow serradella cv. Avila and French serradella/bladder clover generally resulted in increased (P<0.05) pasture crop cover over two growing seasons. Arrowleaf clover and biserrula cv. Casbah were strong performers and produced significantly greater crop biomass and also less weed biomass. However, weed suppression and subsequent biomass was not always related to competition for resources and production of total crop biomass. This was the case for yellow serradella cv. Santorini in both 2016 and 2017 where weed biomass was significantly reduced but total crop biomass produced was limited. This suggested that factors other than resource competition, such as allelopathy, were associated with weed suppression. Arrowleaf clover, biserrula cv. Casbah and yellow serradella cv. Santorini were generally the best and most reliable annual legumes with respect to yearly regeneration and pasture weed suppression in the Riverina
Original languageEnglish
Title of host publicationProceedings of 21st Australian Weeds Conference
Subtitle of host publicationWeed Biosecurity - Protecting our Future
EditorsStephen Johnson, Leslie Weston, Hanwen Wu, Bruce Auld
Place of PublicationSydney
PublisherWeed Society of NSW
Pages379-382
Number of pages4
ISBN (Print)ISBN 978-0-9954159-1-1
Publication statusPublished - 2018
Event21st Australasian Weeds Conference 2018: Weed biosecurity - Protecting our future - Novotel Sydney Manly Pacific, Manly, Australia
Duration: 09 Sep 201812 Sep 2018
https://www.21awc.org.au/
http://caws.org.nz/old-site/awc_contents.php?yr=2018 (conference proceedings)
https://abercrombie.eventsair.com/QuickEventWebsitePortal/21awc/21awc-web/Agenda (conference program)
https://grdc.com.au/events/list/2018/09/21st-australasian-weeds-conference-sydney

Conference

Conference21st Australasian Weeds Conference 2018
CountryAustralia
CityManly
Period09/09/1812/09/18
OtherThe Weed Society of New South Wales Inc., on behalf of the Council of Australasian Weed Societies Inc., will be hosting the 21st Australasian Weeds Conference in the popular Sydney beach side suburb of Manly from 9 - 12 September 2018.  An assortment of field trips will be hosted on Thursday 13 September 2018.

This biennial conference carries on a long tradition of bringing the weed management community together to discuss new developments and share information about cutting-edge and best weed management practices.

The conference attracts over 250 delegates from across Australasia and globally.  Delegates will come together to network with peers, engage with industry sponsors, listen and participate in presentations and field trips on a variety of topics including; 
- New technologies in weed management.
- Biological, mechanical, and chemical weed control and research.
- Herbicide resistance.
- Weeds of crops and pastures.
- Environmental weeds and Weeds of National Significance.
Internet address

Grant Number

  • MLA B.WEE.0146

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