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Texasweed (Caperonia palustris) Interference in Drill-Seeded Rice

Published online by Cambridge University Press:  20 January 2017

Rakesh K. Godara ,
Billy J. Williams ,
Eric P. Webster ,
James L. Griffin  and
James P. Geaghan
Rakesh K. Godara*
Affiliation:
School of Plant Soil and Environmental Sciences, Louisiana State University and A&M College, Baton Rouge, LA 70803
Billy J. Williams
Affiliation:
Scott Research Extension Center, Louisiana State University Agricultural Center, 212-B Macon Ridge Road, Winnsboro, LA 71295
Eric P. Webster
Affiliation:
School of Plant Soil and Environmental Sciences, Louisiana State University and A&M College, Baton Rouge, LA 70803
James L. Griffin
Affiliation:
School of Plant Soil and Environmental Sciences, Louisiana State University and A&M College, Baton Rouge, LA 70803
James P. Geaghan
Affiliation:
Department of Experimental Statistics, Louisiana State University and A&M College, Baton Rouge, LA 70803
*
Corresponding author's E-mail: rkgodara@gmail.com
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Abstract

Field research was conducted near Saint Joseph, LA, in 2008 and 2009 to evaluate Texasweed interference in drill-seeded rice. Season-long Texasweed interference at 1 plant m−2 was estimated to cause 5% yield loss. Yield loss from 10 and 50 plants m−2 was 31 and 61%, respectively. Yield loss was primarily due to a reduction in effective tillers per square meter. Thousand-grain weight of rice was not affected by season-long Texasweed interference. Path analysis indicated yield component compensation, i.e., a reduction in effective tillers per square meter probably caused an increase in grains per panicle. However, that effect was not strong enough to reverse the detrimental effect of reduced effective tillers per square meter on rice yield. The critical period of Texasweed interference to cause more than 5% yield loss was estimated to be between 0 and 6 wk after rice emergence.

Se realizó una investigación de campo en Saint Joseph, LA en 2008 y 2009 para evaluar la interferencia de Caperonia palustris en arroz de siembra directa. La interferencia de 1 planta m−2 de C. palustris a lo largo de todo el ciclo del cultivo se estimó que causó 5% de pérdida en el rendimiento. La pérdida en el rendimiento debido a 10 y 50 plantas m−2 fue 31 y 61%, respectivamente. Esta pérdida se debió primordialmente a una reducción en los retoños o hijos efectivos por m−2. El peso de mil granos de arroz no fue afectado por la interferencia de C. palustris a lo largo del ciclo productivo. Un análisis de trayectoria (path) indicó la presencia de una compensación en el componente de rendimiento (por ejemplo, una reducción en retoños efectivos por m−2 probablemente causó un incremento en granos por panícula). Sin embargo, este efecto no fue suficientemente fuerte para revertir el efecto dañino de la reducción en los retoños efectivos por m−2 sobre el rendimiento. Se estimó que el período crítico de interferencia de C. palustris para evitar 5% de pérdidas en el rendimiento está entre 0 y 6 semanas después de la emergencia del arroz.

Keywords

Texasweed, Caperonia palustris (L.) St. Hil. CNPPArice, Oryza sativa L. ORYSABroadleaf weed competitiontime of removalweed densitycritical period
Type
Weed Biology and Competition
Information
Weed Technology , Volume 26 , Issue 2 , June 2012 , pp. 356 - 363
Copyright
Copyright © Weed Science Society of America 

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