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Rice yield and quality as affected by cultivar and red rice (Oryza sativa) density

Published online by Cambridge University Press:  20 January 2017

Brian V. Ottis ,
Kenneth L. Smith ,
Robert C. Scott  and
Ronald E. Talbert
Brian V. Ottis
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 W. Altheimer Drive, Fayetteville, AR 72704
Robert C. Scott
Affiliation:
Cooperative Extension Service, University of Arkansas, Lonoke Extension and Applied Research Center, P.O. Box 357, Lonoke, AR 72086
Ronald E. Talbert
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 W. Altheimer Drive, Fayetteville, AR 72704
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Abstract

Previous research has examined the extent to which red rice affects both yield and grain quality of cultivated rice. However, this research was conducted over 15 yr ago. Modern long-grain rice cultivars have the potential to produce yields above 10,000 kg ha−1; however, it is unknown whether modern rice cultivars sacrifice competitiveness to achieve higher yields, or if, in fact, they are more competitive. Field studies were conducted in 2002 and 2003 at the Southeast Research and Extension Center near Rohwer, AR, and at the University of Arkansas Pine Bluff Research Farm near Lonoke, AR, to investigate the effect of red rice density on interference between red rice and five rice cultivars (‘CL161’, ‘Cocodrie’, ‘LaGrue’, ‘Lemont’, and ‘XL8’). White rice yield reductions were between 100 and 755 kg ha−1 for every red rice plant m−2. The hybrid rice, XL8, had higher yields than the conventional cultivars. Red rice contamination in milling samples increased linearly as a function of red rice density at Lonoke and Rohwer in 2003. Dockage for each cultivar was calculated on the basis of the relationship between red rice density and red rice contamination. Semidwarf Lemont was the most contaminated and hybrid XL8 the least contaminated by the various densities of red rice.

Keywords

Red rice, Oryza sativa L. ORYSArice, Oryza sativa L. ‘CL161’, ‘Cocodrie’, ‘LaGrue’, ‘Lemont’, ‘XL8’Hybrid riceinterferencered rice
Type
Weed Biology and Ecology
Information
Weed Science , Volume 53 , Issue 4 , August 2005 , pp. 499 - 504
Copyright
Copyright © Weed Science Society of America 

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