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Weed Management and Cotton Yield under Two Row Spacings in Conventional and Conservation Tillage Systems Utilizing Conventional, Glufosinate-, and Glyphosate-based Weed Management Systems

Published online by Cambridge University Press:  20 January 2017

J. S. Aulakh ,
A. J. Price  and
K. S. Balkcom
J. S. Aulakh
Affiliation:
Department of Agronomy and Soils, Auburn University, 201 Funchess Hall, Auburn University, AL 36830
A. J. Price*
Affiliation:
United States Department of Agriculture, Agricultural Research Service, National Soil Dynamics Laboratory, 411 South Donahue Drive, Auburn, AL 36832
K. S. Balkcom
Affiliation:
United States Department of Agriculture, Agricultural Research Service, National Soil Dynamics Laboratory, 411 South Donahue Drive, Auburn, AL 36832
*
Corresponding author's E-mail: [email protected]
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Abstract

A field experiment was conducted during three cropping seasons to compare weed control and cotton yield provided by conventional (CV), glufosinate-resistant (LL), and glyphosate-resistant (RR) weed management systems under standard (102 cm) and narrow (38 cm) row spacing grown in conventional and conservation tillage systems. The conventional tillage and/or CV cotton received a PRE application of pendimethalin. The CV, LL, and RR cotton varieties received two POST applications of pyrithiobac, glufosinate, and glyphosate, respectively, at two- and four-leaf cotton growth stages. A final (LAYBY) application of trifloxysulfuron was applied to 38-cm row cotton while a LAYBY POST-directed spray of prometryn plus MSMA was used in 102-cm row cotton. The LL and RR weed management systems controlled at least 97% of large crabgrass, Palmer amaranth, sicklepod, and smallflower morningglory, while the CV system controlled 89, 73, and 87 to 98% of large crabgrass, smallflower morningglory, and Palmer amaranth, respectively. Sicklepod control increased from 85% in 102-cm rows to 95% in 38-cm rows in the CV herbicide system. Yellow nutsedge and pitted morningglory control exceeded 98% and was not affected by tillage, row spacing, or weed management system. Cotton yield was not affected by row spacing any year, by tillage in 2005, or by weed management system in 2004 and 2005. In 2006, yield in the RR weed management system was 27 and 24% higher than LL and CV weed management systems, respectively. In 2004, yield of conventional tillage cotton was 18% higher than conservation tillage cotton, but in 2006 the yield in conservation tillage was 12% higher than conventional tillage.

Un experimento de campo se llevó al cabo durante tres estaciones de cosecha para comparar el control de malezas y el rendimiento del algodón proporcionado por sistemas de manejo convencionales (CV), resistentes al glufosinato (LL) y resistentes al glifosato (RR), con espacios estándares entre surcos (102 cm) y angosto (38 cm), utilizando sistemas de labranza convencional y de conservación. El algodón en el sistema de labranza convencional y/o el algodón (CV) recibieron una aplicación preemergente de pendimetalina. Las variedades de algodón CV, LL y RR recibieron dos aplicaciones posemergentes de pyrithiobac, glufosinato, y glifosato, respectivamente, en las etapas de dos y cuatro hojas de crecimiento. Una aplicación final de trifloxysulfuron se aplicó al algodón entre los surcos de 38 cm, mientras que una aplicación posemergente dirigida de prometrina más MSMA se usó entre los surcos de 102 cm. Los sistemas de manejo de malezas LL y RR controlaron al menos 97% de Digitaria sanguinalis, Amaranthus palmeri, Senna obtusifolia y Jacquemontia tamnifolia, mientras que el sistema CV controló 89, 73 y de 87 a 98% de Digitaria, de Jacquemontia y de Amaranthus. El control de Senna se incrementó de 85% en los surcos de 102 cm, a 95% en los surcos de 38 cm utilizando el sistema convencional (CV). El control de Cyperus esculentus e Ipomoea lacunosa excedió 98% y no se vio afectado por la labranza, el espacio entre surcos o el sistema de manejo de malezas. El rendimiento de algodón no se vio afectado por el espacio entre surcos en ningún año, por la labranza en 2005, ni por el sistema de manejo de malezas en 2004 y 2005. En 2006, el rendimiento obtenido con el sistema de manejo RR fue 27 y 24% más alto que con los sistemas LL y CV, respectivamente. En 2004, el rendimiento del algodón con labranza convencional fue 18% mayor que con labranza de conservación, pero en 2006 el rendimiento con labranza de conservación fue 12% mayor que con labranza convencional.

Keywords

Glufosinateglyphosatemonosodium methanearsonate (MSMA)pendimethalinprometrynpyrithiobactrifloxysulfuronlarge crabgrass, Digitaria sanguinalis (L.) Scop. DIGSAPalmer amaranth, Amaranthus palmeri S. Wats. AMAPApitted morningglory, Ipomoea lacunosa L. IPOLAsicklepod, Senna obtusifolia (L.) H.S. Irwin & Barneby SENOBsmallflower morningglory, Jacquemontia tamnifolia (L.) Griseb. IAQTAyellow nutsedge, Cyperus esculentus L. CYPEScotton, Gossypium hirsutum L.Cover cropherbicide seed traitintegrated pest management
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 25 , Issue 4 , December 2011 , pp. 542 - 547
Copyright
Copyright © Weed Science Society of America 

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