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Weed Management in Mechanized-Sown, Zero-Till Dry-Seeded Rice

Published online by Cambridge University Press:  20 January 2017

Bhagirath S. Chauhan  and
Seth B. Abugho
Bhagirath S. Chauhan*
Affiliation:
Crop and Environmental Sciences Division, International Rice Research Institute, Los Baños 4031, Philippines
Seth B. Abugho
Affiliation:
Crop and Environmental Sciences Division, International Rice Research Institute, Los Baños 4031, Philippines
*
Corresponding author's E-mail: b.chauhan@irri.org.
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Abstract

Weeds are the main constraint in the adoption of zero-till, dry-seeded rice systems because weeds and rice emerge simultaneously in these systems, and there is no standing water at crop establishment to suppress weeds. A study was conducted during the wet season of 2011 and the dry season of 2012 at the International Rice Research Institute to evaluate the performance of different herbicides in mechanized-sown, zero-till dry-seeded rice. Among the treatments evaluated, oxadiazon followed by penoxsulam + cyhalofop followed by one hand-weeding at 42 d after sowing, provided 23 to 35% higher yield than the nontreated control. The yields in the oxadiazon-treated plots were similar to those in the weed-free plots. Some weed species, including eclipta and doveweed, were not controlled by the evaluated herbicides. Therefore, there is a need to evaluate additional herbicides and to integrate them with cultural weed management strategies to manage such problematic weeds.

Las malezas son la principal limitante para la adopción de la labranza cero en sistemas de arroz sembrado en secano porque en estos sistemas las malezas y el arroz emergen simultáneamente y no hay una lámina de agua presente que suprima las malezas al momento del establecimiento del cultivo. Se realizó un estudio durante la época lluviosa de 2011 y la época seca de 2012 en el Instituto Internacional de Investigaciones sobre el Arroz para evaluar el desempeño de diferentes herbicidas en siembra mecanizada, labranza cero y siembra de arroz de secano. Entre los tratamientos evaluados, oxadiazon seguido de penoxsulam + cyhalofop seguido por una deshierba manual a 42 d después de la siembra, resultó en un rendimiento 23 a 35% mayor que el testigo no-tratado. Los rendimientos en las parcelas tratadas con oxadiazon fueron similares a los de las parcelas libres de malezas. Algunas especies de malezas, incluyendo Eclipta prostrata y Murdannia nudiflora, no fueron controladas por los herbicidas evaluados. Por esta razón, existe la necesidad de evaluar herbicidas adicionales y su integración con estrategias de manejo cultural para el manejo de estas malezas problemáticas.

Keywords

CyhalofopoxadiazonpenoxsulamdoveweedMurdannia nudiflora (L.) Brenan MUDNUecliptaEclipta prostrata (L.) L. ECLALriceOryza sativa L. ORYSABiomassdry-seeded riceefficacyweed densityzero-till
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 27 , Issue 1 , March 2013 , pp. 28 - 33
Copyright
Copyright © Weed Science Society of America 

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