Competitive interactions between weedy rice and cultivated rice as a function of added nitrogen and the level of competition

Chauhan, Bhagirath S. and Johnson, David E. (2011) Competitive interactions between weedy rice and cultivated rice as a function of added nitrogen and the level of competition. Weed Biology and Management, 11 4: 202-209. doi:10.1111/j.1445-6664.2011.00421.x


Author Chauhan, Bhagirath S.
Johnson, David E.
Title Competitive interactions between weedy rice and cultivated rice as a function of added nitrogen and the level of competition
Journal name Weed Biology and Management   Check publisher's open access policy
ISSN 1444-6162
1445-6664
Publication date 2011-01-01
Sub-type Article (original research)
DOI 10.1111/j.1445-6664.2011.00421.x
Volume 11
Issue 4
Start page 202
End page 209
Total pages 8
Place of publication Richmond, VIC, Australia
Publisher Wiley-Blackwell
Language eng
Abstract The competitive outcomes between weedy rice from Malaysia (MWR), the Philippines (PWR), and Vietnam (VWR) and cultivated rice (IR64) grown in pots were evaluated in a replacement series experiment with added N (0, 50, 100, and 150kgNha -1) and competition with IR64 plants (no competition, eight weedy rice plants:0 IR64 plants; low competition, six weedy rice plants:two IR64 plants; and high competition, two weedy rice plants:six IR64 plants). The growth observations were taken at 10weeks after sowing. When grown in a monoculture (no competition with IR64 plants), the PWR plants had a lower shoot biomass across N rates than did the MWR and VWR plants. The leaf area and shoot biomass of weedy rice across populations significantly increased with an increase in the N application rate. Each weedy rice population and the IR64 population showed linear responses of the leaf area and shoot biomass to the N rate at all levels of competition. The weedy rice and IR64 plants, when grown without competition, had a similar rate of response in the shoot biomass to the N rate. However, when grown in competition, the response to the added N varied among the weedy rice populations. The MWR plants under competition produced a similar amount of shoot biomass to the IR64 plants per unit addition of N. In contrast, the PWR and VWR populations under competition produced a greater amount of shoot biomass with each additional unit of N, compared to the IR64 population. The results illustrate that N fertilizer management might affect the outcome of weedy rice competition. This information could be incorporated into weedy rice management strategies. © 2011 The Authors. Weed Biology and Management
Keyword IR64
Leaf area
Nitrogen
Shoot biomass
Weedy rice
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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