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Effect of Soil Organic Matter Content and Volumetric Water Content on ‘Tifway 419’ Hybrid Bermudagrass Growth Following Indaziflam Applications

Published online by Cambridge University Press:  20 January 2017

Matthew D. Jeffries  and
Travis W. Gannon
Matthew D. Jeffries*
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
Travis W. Gannon
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
*
∗Corresponding author's E-mail: [email protected]
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Abstract

Indaziflam is a cellulose biosynthesis–inhibiting herbicide for PRE annual weed control in turfgrass systems. Since indaziflam's 2010 U.S. registration, sporadic cases of hybrid bermudagrass injury have been reported; however, causes are not well understood. Field research was conducted from 2013 to 2015 on sandy soil to elucidate the effects of soil organic matter content (SOMC) and soil volumetric water content (SVWC) on plant growth following indaziflam application on established or root-compromised (5 cm long) hybrid bermudagrass. The effect of SOMC was evaluated at two levels, 1.4 (low) and 5.5% (high) w/w at the soil surface (0 to 2.5 cm depth), whereas SVWC was evaluated PRE (2 wk before) and POST (6 wk after) indaziflam application at two levels (low or high). Indaziflam was applied (50 or 100 g ai ha−1) at fall-only, fall-plus-spring, and spring-only timings. Regardless of application timing or SVWC, indaziflam applied at 50 g ha−1 to high SOMC did not cause > 10% visual cover reduction on established or root-compromised hybrid bermudagrass. Indaziflam applied to hybrid bermudagrass on low SOMC exacerbated adverse growth effects, most notably when root systems were compromised before application. Overall, PRE indaziflam application SVWC did not affect hybrid bermudagrass growth. Within low SOMC, low POST indaziflam application SVWC caused less visual hybrid bermudagrass cover reduction than did high POST indaziflam application SVWC, whereas both fall-plus-spring and spring-only application timings caused similarly greater reductions than fall-only indaziflam application. Data from this research will aid turfgrass managers to effectively use indaziflam without adversely affecting hybrid bermudagrass growth.

Indaziflam es un herbicida inhibidor de la biosíntesis de cellulose para el control PRE de malezas anuales en sistemas de céspedes. Desde el registro de indaziflam en Estados Unidos en 2010, se han reportado casos esporádicos de daño en el césped bermuda híbrido, aunque las causas no se conocen bien. Entre 2013 y 2015, se realizó una investigación de campo en un suelo arenoso, para elucidar los efectos del contenido de materia orgánica del suelo (SOMC) y el contenido volumétrico de agua del suelo (SVWC) sobre el crecimiento vegetal después de la aplicación de indaziflam a un césped bermuda híbrido establecido o con un sistema radicular comprometido (5 cm de largo). El efecto de SOMC fue evaluado a dos niveles, 1.4 (bajo) y 5.5% (alto) peso/peso, en la superficie del suelo (0 a 2.5 cm de profundidad), mientras que SVWC fue evaluado antes (2 semanas antes) y después (6 semanas después) de la aplicación de indaziflam a dos niveles (bajo o alto). Indaziflam fue aplicado (50 ó 100 g ai ha−1) solamente en el otoño, el otoño más la primavera, y solamente la primavera. Sin importar el momento de aplicación o SVWC, indaziflam aplicado a 50 g ha−1 a alto SOMC no causó >10% de reducción en la cobertura estimada visualmente en césped bermuda híbrido establecido o con raíces comprometidas. Indaziflam aplicado a césped bermuda híbrido con bajo SOMC exacerbó los efectos adversos en el crecimiento, más notablemente cuando los sistemas radiculares estuvieron comprometidos antes de la aplicación. En general, la aplicación PRE de indaziflam según SVWC no afectó el crecimiento del césped bermuda híbrido. Con bajo SOMC, la aplicación de indaziflam POST con bajo SVWC causó menos reducción en la cobertura estimada visualmente del césped bermuda híbrido que la aplicación POST de indaziflam con alto SVWC, mientras que los momentos de aplicación en el otoño más la primavera y solamente en la primavera causaron mayores reducciones (similares entre ellos) que la aplicación solamente en el otoño. Los datos de esta investigación ayudarán a los profesionales en céspedes para usar efectivamente indaziflam sin afectar adversamente el crecimiento del césped bermuda híbrido.

Keywords

Indaziflamhybrid bermudagrass, Cynodon dactylon (L.) Pers. × Cynodon transvaalensis Burtt-Davey ‘Tifway 419’Best management practicecellulose biosynthesis inhibitionherbicide injurynormalized difference vegetation indexvisual cover
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 3 , September 2016 , pp. 677 - 687
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate editor for this paper: Barry Brecke, University of Florida

References

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