Competition of sorghum cultivars and densities with Japanese millet (Echinochloa esculenta)

Wu, Hanwen, Walker, Steven R., Osten, Vikki A. and Robinson, Geoff (2010) Competition of sorghum cultivars and densities with Japanese millet (Echinochloa esculenta). Weed Biology and Management, 10 3: 185-193. doi:10.1111/j.1445-6664.2010.00383.x


Author Wu, Hanwen
Walker, Steven R.
Osten, Vikki A.
Robinson, Geoff
Title Competition of sorghum cultivars and densities with Japanese millet (Echinochloa esculenta)
Formatted title
Competition of sorghum cultivars and densities with Japanese millet (Echinochloa esculenta)
Journal name Weed Biology and Management   Check publisher's open access policy
ISSN 1444-6162
1445-6664
Publication date 2010-09-01
Sub-type Article (original research)
DOI 10.1111/j.1445-6664.2010.00383.x
Volume 10
Issue 3
Start page 185
End page 193
Total pages 8
Place of publication Richmond, VIC, Australia
Publisher Wiley-Blackwell Publishing Asia
Collection year 2011
Language eng
Formatted abstract
Field studies were conducted at two locations in southern Queensland, Australia during the 2003–2004 and 2004–2005 growing seasons to determine the differential competitiveness of sorghum (Sorghum bicolor L. Moench) cultivars and crop densities against weeds and the sorghum yield loss due to weeds. Weed competition was investigated by growing sorghum in the presence or absence of a model grass weed, Japanese millet (Echinochloa esculenta). The correlation analyses showed that the early growth traits (height, shoot biomass, and daily growth rate of the shoot biomass) of sorghum adversely affected the height, biomass, and seed production of millet, as measured at maturity. “MR Goldrush” and “Bonus MR” were the most competitive cultivars, resulting in reduced weed biomass, weed density, and weed seed production. The density of sorghum also had a significant effect on the crop's ability to compete with millet. When compared to the density of 4.5 plants per m2, sorghum that was planted at 7.5 plants per m2 suppressed the density, biomass, and seed production of millet by 22%, 27% and 38%, respectively. Millet caused a significant yield loss in comparison with the weed-free plots. The combined weed-suppressive effects of the competitive cultivars, such as MR Goldrush, and high crop densities minimized the yield losses from the weeds. These results indicate that sorghum competition against grass weeds can be improved by choosing competitive cultivars and by using a high crop density of >7.5 plants per m2. These non-chemical options should be included in an integrated weed management program for better weed management, particularly where the control options are limited by the evolution of herbicide resistance.
Keyword Crop Density
Cultivar
Grass Weeds
Integrated Weed Management
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Agriculture and Food Sciences
 
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Created: Tue, 08 Mar 2011, 02:18:23 EST