Full TGIF Record # 225876
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=475
    Last checked: 07/25/2013
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Author(s):Brosnan, J. T.; DeFrank, J.; Woods, M. S.; Breeden, G. K.
Author Affiliation:Brosnan, Woods and Breeden: Plant Sciences, University of Tennessee, Knoxville, TN; DeFrank: Tropical Plant and Soil Sciences, University of Hawaii, Honolulu, HI
Title:Efficacy of sodium chloride salt applications for postemergence grassy weed control in seashore paspalum turf
Section:Turf and ornamentals
Other records with the "Turf and ornamentals" Section
Meeting Info.:Orlando, Florida: February 9-12, 2009
Source:2009 Proceedings, Southern Weed Science Society. Vol. 62, 2009, p. 405.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Application rates; Cultivar evaluation; Herbicide evaluation; MSMA; Metribuzin; Paspalum conjugatum; Paspalum vaginatum; Postemergence weed control; Sodium chloride
Cultivar Names:Salam
Abstract/Contents:"Seashore paspalum (Paspalum vaginatum Swartz.) is a prostrate, perennial turfgrass that is indigenous to tropical and coastal areas and is consequently used extensively on golf courses throughout Hawaii. Halophytic in nature, seashore paspalum can tolerate higher salinity levels than other plant species, which suggests that applications of sodium chloride could be used for postemergence grassy weed control on established stands; however, minimal efficacy data has been published on the subject. Field research was conducted in 2007 and 2008 to evaluate the efficacy of sodium chloride applications for control of sourgrass (Pasapalum conjugatum Berg.), a grassy weed commonly found infesting seashore paspalum golf course fairways in Hawaii. Studies were conducted on a 'Salam' seashore paspalum fairway at Koolau Golf Course (Kaneohe,HI). Three salt products were evaluated: fine salt (99% sodium chloride, 1% sodium silicoaluminate, 83% of particles 0.50-0.25 mm in diameter), coarse salt (100% sodium chloride, 75% of particles 2.0-1.0 mm in diameter), and a salt solution produced from dissolving fine salt in distilled water. Each of these products was applied singly at 1464 kg/ha and sequentially (three applications on a 7 d interval) at 488 kg/ha. The efficacy of these treatments was compared to single and sequential (14 d interval) applications of MSMA at 2.4 kg/ha and 1.12 kg/ha, respectively, as well as single and sequential (14 d interval) applications of MSMA + metribuzin, at rates of 2.4 kg/ha + 0.56 kg/ha and 1.12 kg/ha + 0.28 kg/ha, respectively. The fine salt and coarse salt treatments were applied granularly using a shaker jar. Salt solution, MSMA, and MSMA + metribuzin treatments were applied using a CO2-powered boom sprayer calibrated to deliver 374 L/ha using a single flat-fan 8004E nozzle at 275 kPa configured to provide a 0.9-m spray swath. 'Salt solution' treatments were applied using the same boom sprayer and nozzle, calibrated to deliver 1487 L/ha and 4761 L/ha, respectively. Increased carrier volume was needed in order to create salt solutions delivering 488 and 1464 kg/ha. Sourgrass control was assessed visually on a 0 (no injury) to 100% (complete plant death) scale. Seashore paspalum and sourgrass injury were assessed quantitatively through measurements of relative chlorophyll index (R840/R700) using a hand held chlorophyll meter. Data were collected 1, 2, 3, and 6 weeks after initial treatment (WAIT). One soil core was also removed from each plot at 6 WAIT and analyzed for sodium adsorption ratio (SAR) and electrical conductivity (ECe). A single granular application of fine salt at a rate of 1464 kg/ha provided 84% and 23% control of sourgrass 6 WAIT in 2007 and 2008, respectively. Sequential granular applications of fine salt at 488 kg/ha provided 92% and 96% control of sourgrass in 2007 and 2008, respectively, at 6 WAIT. Sequential applications of salt solution yielded a similar response in both 2007 and 2008. Granular applications of a coarse salt provided a lower level of control than fine salt at both the 1464 and 488 kg/ha rates on 3 out of 4 rating dates in 2008; a similar trend was observed in 2007, but no significant differences were observed between these treatments. All salt treatments measured higher in soil sodium adsorption ratio (SAR) and electrical conductivity (ECe) than the untreated check; however, levels reported in this study were significantly lower than the threshold SAR and ECe levels that have been associated with reduced seashore paspalum growth. Sequential applications of MSMA at 1.12 kg/ha and MSMA plus metribuzin at 1.12 kg/ha and 0.28 kg/ha, respectively, provided greater than 90% control in 2008, but less than 40% control in 2007. Greater seashore paspalum injury was observed following applications of MSMA and MSMA plus metribuzin than following salt applications. These data suggest that sequential applications of fine salt can be used to control sourgrass infesting seashore paspalum turf."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Brosnan, J. T., J. DeFrank, M. S. Woods, and G. K. Breeden. 2009. Efficacy of sodium chloride salt applications for postemergence grassy weed control in seashore paspalum turf. South. Weed Sci. Soc. Proc. 62:p. 405.
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http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=475
    Last checked: 07/25/2013
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    Notes: Item is within a single large file
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