Full TGIF Record # 227330
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=88
    Last checked: 08/12/2013
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Author(s):Jones, P. A.; Brosnan, J.; Kopsell, D. A.; Breeden, G. K.
Author Affiliation:University of Tennessee, Knoxville, TN
Title:Effect of organic matter on hybrid bermudagrass injury with preemergence herbicides in sand-based rootzones
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Meeting Info.:Houston, Texas: January 28-30, 2013
Source:Proceedings of the Southern Weed Science Society: 66th Annual Meeting. Vol. 66, 2013, p. 1.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Cynodon dactylon x Cynodon transvaalensis; Hybrid bermudagrasses; Injurious factors; Organic matter; Preemergence herbicides; Sand-based root zones; Sphagnum peat moss
Cultivar Names:Tifway
Abstract/Contents:"Preemergence (PRE) herbicide applications in sand-based rootzones have been reported to result in root and shoot hybrid bermudagrass (C. dactylon x. C. transvaalensis Burtt-Davey, cv. Tifway) injury. Research was conducted in 2012 to determine the impact of organic matter content on hybrid bermudagrass injury with PRE herbicide applications was established from washed sod in mini-rhizotrons containing four sand rootzones uniformly blended with organic matter: 1) a 95:5 mix containing 0.003 kg kg-1 organic matter; 2) an 80:20 mix containing 0.007 kg kg-1 organic matter; and 3) a 60:40 mix containing 0.012 kg kg-1 organic matter; and 4) a 100:0 mix containing 0.000 kg kg-1 organic matter. In all rootzones the organic matter source was sphagnum peat moss. Herbicide treatments included indaziflam (35 and 52.5 g ha-1) and prodiamine (840 g ha-1). Plants were allowed to acclimate for two weeks prior to herbicide application. Bermudagrass injury was visually evaluated weekly after application using a 0 (no injury) to 100 (complete kill) scale. At 6 weeks after treatment (WAT) roots were washed free of debris and excised as close to the crown as possible. WinRhizo software was used to characterize root length (cm), root length density (cm cm-3), and root surface area (cm2). Significant hybrid bermudagrass foliar injury was observed with indaziflam at 52.5 g ha-1 in the sand rootzone with no organic matter. Injury ranged from 4 to 61% from 1 to 6 WAT. Increasing organic matter from 0.003 to 0.007 kg kg-1 reduced hybrid bermudagrass injury on every evaluation date, regardless of herbicide. Increasing levels of organic matter decreased foliar injury symptoms; however, no significant reductions were seen when organic matter increased from 0.007 to 0.012 kg kg-1. Root length, root length density, and root surface area values were lowest in sand rootzones with <= 0.003 kg kg-1 organic matter. Consequently, these values were greatest in sand rootoznes with >= 0.007 kg kg-1 organic matter. When averaged over all four rootzones, prodiamine and indaziflam at 52.5 g ha-1 reduced all three parameters by 50 to 65%. Results of this study suggest that soil organic matter content affects hybrid bermudagrass injury potential with PRE herbicide applications on sand based-rootzones."
See Also:Original version appears in 67th Annual Meeting of the North Central Weed Science Society, Vol. 67 2012, p. 38, R=224626. R=224626
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Jones, P. A., J. Brosnan, D. A. Kopsell, and G. K. Breeden. 2013. Effect of organic matter on hybrid bermudagrass injury with preemergence herbicides in sand-based rootzones. South. Weed Sci. Soc. Proc. 66:p. 1.
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http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=88
    Last checked: 08/12/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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