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Performance of Different Herbicides in a Dry-Seeded Rice System in Sri Lanka

Published online by Cambridge University Press:  20 January 2017

Bhagirath S. Chauhan ,
Anuruddika S.K. Abeysekara ,
Sakinda D. Kulatunga  and
Upali B. Wickrama
Bhagirath S. Chauhan*
Affiliation:
Crop and Environmental Sciences Division, International Rice Research Institute, Los Baños, Philippines
Anuruddika S.K. Abeysekara
Affiliation:
Rice Research and Development Institute, Batalagoda, Sri Lanka
Sakinda D. Kulatunga
Affiliation:
Rice Research and Development Institute, Batalagoda, Sri Lanka
Upali B. Wickrama
Affiliation:
Rice Research and Development Institute, Batalagoda, Sri Lanka
*
Corresponding author's E-mail: [email protected]
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Abstract

Dry-seeded rice systems are an emerging production technology in many Asian countries. A field study was conducted in 2011 and 2012 at the farm of the Rice Research and Development Institute, Batalagoda, Sri Lanka, to evaluate the performance of different herbicides in a dry-seeded rice system. Weed control treatments were nontreated (weedy), pretilachlor plus pyribenzoxim, cyhalofop-butyl, thiobencarb plus propanil, propanil, and bispyribac-sodium plus metamifop. All these POST herbicides were applied at 8 d after sowing, followed by an MCPA spray at 20 d after sowing. The dominant weeds in the study were barnyardgrass, Chinese sprangletop, and knotgrass. All herbicide treatments provided similar weed control, which ranged from 82 to 99%. Weeds in the nontreated plots reduced rice grain yield by 58 to 79% compared with the herbicide-treated plots. All herbicide-treated plots, except cyhalofop-butyl-treated ones, produced similar grain yield, which ranged from 3.7 to 4.2 t ha−1 in 2011 and from 6.0 to 7.0 t ha−1 in 2012. The results of our study suggest that different herbicides provided similar weed control and therefore different herbicides can be rotated in different seasons to reduce selection pressure on weeds.

Los sistemas de siembra en seco de arroz son una tecnología que está surgiendo en muchos países asiáticos. En 2011 y 2012, se realizó un experimento de campo en la finca del Instituto de Investigación y Desarrollo del Arroz, Batalagoda, Sri Lanka, para evaluar el desempeño de diferentes herbicidas en un sistema de arroz de siembra en seco. Los tratamientos de control de malezas fueron sin-tratamiento (enmalezado), pretilachlor más pyribenzoxim, cyhalofop-butyl, thiobencarb más propanil, propanil, y bispyribac-sodium más metamifop. Todos estos herbicidas POST fueron aplicados a 8 días después de la siembra, seguidos de una aspersión con MCPA a 20 días después de la siembra. Las malezas dominantes en el estudio fueron Echinochloa crus-galli, Leptochloa chinensis, y Paspalum distichum. Todos los tratamientos de herbicidas brindaron un control de malezas similar, el cual varió entre 82 y 99%. Las malezas en las parcelas sin tratamiento redujeron el rendimiento de grano del arroz en 58 a 79%, al compararse con las parcelas tratadas con herbicidas. Todas las parcelas tratadas con herbicidas, excepto aquellas tratadas con cyhalofop-butyl, produjeron un rendimiento de grano similar, el cual varió entre 3.7 a 4.2 t ha−1 en 2011 y entre 6.0 y 7.0 t ha−1 en 2012. Los resultados de nuestro estudio sugieren que los diferentes herbicidas brindaron un control de malezas similar, y por lo tanto, diferentes herbicidas pueden ser rotados en diferentes temporadas de producción para reducir la presión de selección sobre las malezas.

Keywords

BarnyardgrassEchinochloa crus-galli (L.) BeauvChinese sprangletopLeptochloa chinensis (L.) NeesknotgrassPaspalum distichum L.riceOryza sativa L.Asiaherbicide efficacyweed biomassweed density
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 27 , Issue 3 , September 2013 , pp. 459 - 462
Copyright
Copyright © Weed Science Society of America 

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