CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Animal Production Science   
Animal Production Science
Journal Banner
  Food, Fibre and Pharmaceuticals from Animals
blank image Search
blank image blank image
blank image
  Advanced Search

Journal Home
About the Journal
Editorial Board
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Research Fronts
Virtual Issues
Sample Issue
For Authors
General Information
Notes for Authors
Submit Article
Open Access
For Referees
Referee Guidelines
Review Article
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter youtube


Article << Previous     |     Next >>   Contents Vol 45(4)

Impacts of retained wheat stubble on canola in southern New South Wales

S. E. Bruce A B C, J. A. Kirkegaard A, J. E. Pratley B, G. N. Howe A

A CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia.
B Charles Sturt University, Wagga Wagga, NSW 2678, Australia.
C Present address: CSIRO Sustainable Ecosystems, GPO Box 284, Canberra, ACT 2601, Australia. Corresponding author: Email: sarah.bruce@csiro.au
PDF (328 KB) $25
 Export Citation


Field experiments were conducted in southern New South Wales to determine the effect of surface-retained wheat stubble on the emergence, growth and yield of canola. The 5 experiments included treatments to investigate the impact of stubble load, stubble cultivar and level of decomposition as well as the impact of different environments on the crop response. Overall, 5 t/ha of surface-retained wheat stubble reduced the rate of emergence, plant establishment (mean reduction 33%), vegetative biomass (–56%) and yield (–23%), although the impact varied with site and season. Laboratory experiments assessing the phytoxicity of stubble revealed the possible role of allelopathy in the growth response at 1 site; however, there was no correlation between laboratory phytotoxicity of different stubble cultivars and their impact on canola growth at any other site. Wheat stubble comprising thinner stems (lower straw linear density) had a greater impact on emergence at 2 of the sites, indicating a possible role of reduced light penetration in the growth response. Colder temperatures on the surface of the stubble also reduced emergence and growth, and caused seedling death at the coldest sites. The experiments confirm the widely observed phenomenon of poor canola growth in surface-retained wheat stubble, and suggest several possible mechanisms for the effect, although further studies are required to determine their relative importance in different environments.

Keywords: stubble retention, canola, hypocotyl, direct drilling, phytotoxicity, allelopathy, phytotoxins, allelochemicals, leachates.

Subscriber Login

Legal & Privacy | Contact Us | Help


© CSIRO 1996-2014