Long term impact of harvest weed seed destruction on annual ryegrass

Document Type

Conference Proceeding

Publication Date

9-2016

Conference Title

20th Australasian Weeds Conference

Place of Publication

Perth

ISBN

978-0-646-96031-9

Keywords

Lolium rigidum, Weed Seed Wizard, model, seed production, residue burning, seedbank

Disciplines

Agricultural Science | Agronomy and Crop Sciences | Weed Science

Abstract

A long term trial (2003 to 2013) investigated annual ryegrass seed production in a crop rotation in Merredin, WA. The weed control methods in the trial included herbicides, or herbicides combined with weed seed destruction at harvest. Data from this trial was used to investigate varying scenarios of harvest weed seed destruction using the Weed Seed Wizard (WSW) model. The WSW demonstrated that herbicides plus weed seed destruction at harvest could reduce the annual ryegrass seedbank to very low levels over eight years. Use of herbicides alone did not reduce the seedbank to the same extent over the entire 11 year span of the trial. Harvest weed seed destruction in alternate years reduced the annual ryegrass seedbank to very low levels compared to use of herbicides alone.

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