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Barnyardgrass (Echinochloa crus-galli) Control and Rice Density Effects on Rice Yield Components

Published online by Cambridge University Press:  20 January 2017

Brian V. Ottis  and
Ronald E. Talbert
Brian V. Ottis*
Affiliation:
Division of Plant Sciences, University of Missouri–Columbia, Portageville, MO 63873
Ronald E. Talbert
Affiliation:
Department of Crops, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
*
Corresponding author's E-mail: [email protected]
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Abstract

The response of new, high-yielding rice cultivars to varying barnyardgrass control levels and rice plant densities is not well understood. Studies were conducted in 2002 through 2004 at the Rice Research and Extension Center near Stuttgart, AR, to evaluate three new rice cultivars at plant densities ranging from 79 to 392 plants/m2 grown in competition with barnyardgrass. Representatives from each of the three classes of long-grain rice produced in the United States were selected. ‘Wells’ represented conventional, long-grain rice, ‘CL161’ represented semidwarf, imidazolinone-tolerant, long-grain rice, and ‘XL8’ represented hybrid, long-grain rice. Rice density and barnyardgrass control affected rice total aboveground biomass production, panicle weight, and harvest index. As rice density decreased or barnyardgrass control increased, total aboveground biomass production and harvest index increased. Rice density had no effect on panicle density or yield. Panicle density increased 14 panicles/m2 for every 10% increase in barnyardgrass control. Cultivar yields were affected similarly by barnyardgrass control, and increased 750 kg/ha for each 10% increase in barnyardgrass control. XL8 and Wells produced the highest average yields, with CL161 producing the lowest over the three-year experiment. XL8 yield components fluctuated more than CL161 or Wells over the range of rice densities and barnyardgrass control levels, indicating that XL8 is highly sensitive to intra- and interspecific competition at high plant populations.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGrice, Oryza sativa L. ‘CL161’, ‘Wells’, ‘XL8’Competitiondensityhybrid riceseeding rate
Type
Research
Information
Weed Technology , Volume 21 , Issue 1 , March 2007 , pp. 110 - 118
Copyright
Copyright © Weed Science Society of America 

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