Weed Suppression Potential of ‘Rondo’ and Other Indica Rice Germplasm Lines

Research was conducted to evaluate the weed suppression potential of ‘Rondo’ (4484-1693; PI 657830), a sister line (4484-1665), and other indica rice lines against barnyardgrass in field plots in Stuttgart, AR, using minimal herbicide inputs in two separate 3-yr experiments. Under weed pressure, Ron...

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Bibliographic Details
Published in:Weed technology 2012-07, Vol.26 (3), p.517-524
Main Authors: Gealy, David R, Yan, WenGui
Format: Article
Language:English
Subjects:
Assembly lines
Biomass
Biomass production
competition
Crop production
Crop science
Crop yield
Crop–weed interference
Cultivars
Echinochloa crus-galli
genetic lines
germplasm
grain yield
Herbicides
indica rice
Memory interference
organic production
Oryza sativa
Plants
Rice
Seeds
Tillering
Tillers
WEED BIOLOGY AND COMPETITION
weed control
Weeds
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Summary:Research was conducted to evaluate the weed suppression potential of ‘Rondo’ (4484-1693; PI 657830), a sister line (4484-1665), and other indica rice lines against barnyardgrass in field plots in Stuttgart, AR, using minimal herbicide inputs in two separate 3-yr experiments. Under weed pressure, Rondo and the sister line (4484-1665) generally produced yields that were comparable to those of weed-suppressive indica standards and approximately 50% greater than those of the least-suppressive commercial cultivars, such as ‘Kaybonnet’, ‘Katy’, and ‘Lemont’. Rice yield under weed pressure was correlated with weed-free yield and harvest height. Indica lines tended to produce more tillers than did the commercial cultivars. Tillering potential under weed-free conditions was not correlated with weed suppression or yield loss; however, tillering under weed pressure was strongly correlated with weed suppression and biomass, and yield and yield loss under the weed densities in these experiments. Rondo is presently being used for commercial organic rice production in Texas, in part due to its high yield potential and ability to suppress or tolerate rice pests, including weeds. Our results suggest that the weed-suppressive ability of Rondo and the other indica lines evaluated in these experiments is superior to that of many commercial cultivars. Nomenclature: Barnyardgrass, Echinochloa crus-galli (L.) Beauv.; rice, Oryza sativa L.
ISSN:0890-037X
1550-2740
DOI:10.1614/wt-d-11-00141.1