Full TGIF Record # 227334
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=92
    Last checked: 08/12/2013
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Author(s):Souza, G. S. F.; McElroy, J. S.; Martins, D.; Flessner, M. L.; Toombs, J. N.
Author Affiliation:Souza and Martins: Universidade Estadual Paulista - UNESP, Botucatu, Brazil; McElroy, Flessner and Toombs: Auburn University, Auburn, AL
Title:Germination and herbicide response of carpetgrassĆ¢
Section:Posters
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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. 5.
# of Pages:1
Publishing Information:Champaign, Illinois: Southern Weed Science Society
Keywords:TIC Keywords: Axonopus affinis; Germination; Herbicide evaluation; Osmotic stress; Postemergence herbicides; Salinity; Soil pH
Abstract/Contents:"Common carpetgrass (Axonopus affinis Chase) is a warm-season grass species prevalent throughout the Coastal Plain region of the southeastern United States. Carpetgrass is used on roadsides, lawns, parks, pastures and other low-maintenance turfgrass areas, which may remain too wet for other warm season turfgrasses to thrive (McCarty and Colvin, 1991). Seed germination is influenced by many environmental factors (Bush et al. 2000). Carpetgrass is slow to establish via seed, allowing weeds to germinate and develop, making selective postemergence herbicides a necessity when a establishing a weed free carpetgrass area. The objectives of this study were (i) to determine the effects of pH, osmotic stress, and salinity on germination of common carpetgrass and (ii) to evaluate the response of two A. affinis populations to widely used postemergence herbicides for turfgrass management. Two populations of carpetgrass seeds were obtained from Outsidepride.com (named OTSP) and Athens Seed Co. (named ATSC) in April 2012. These studies were conducted in greenhouse and growth chamber in the Agronomy and Soils department of Auburn University, Alabama, during April-August 2012. Experiments were repeated in time and data were collected 2 and 4 weeks after treatment (WAT). For growth chamber experiments were evaluated the effect of pH, osmotic stress and, salinity on carpetgrass seed germination. For growth chamber experiments Germination Percentage (GP), Germination Rate (GR), Germination Index (GI) and, Coefficient of Velocity of Germination (CVG) were determined. For the greenhouse experiments herbicides treatments were applied in postemergence with a enclosed research cabinet delivering 280 L ha-1 by a single TP8002EVS nozzle4 at 193 kPa and the herbicides utilized was: fluazifop-P-butyl, sethoxydim, foramsulfuron, sulfosulfuron, trifloxysulfuron, atrazine, metribuzin, siduron, simazine, carfentrazone-ethyl, oxadiazon, sulfentrazone, mesotrione, glufosinate, pronamide, triclopyr, ethofumesate, dicamba and, quinclorac. The study was conducted as completely randomized design with three replications and one pot per experimental unit. Data included Percent Visual Necrosis (PVN) and Plant Height at 2 and 4 WAT and Fresh Mass at 4 WAT. Reductions of plant Height and Fresh Mass were calculated relative to the nontreated. GP, GR and GI decreased with increase in water stress on both carpetgrasses populations. However, the CVG remained constant in the OTSP population until -0.4MPa of water stress unlike ATSC population, which showed decreases in CVG with increase in water stress. Plant height of both carpetgrasses was constant until -0.2 MPa of water stress; after this point height decreased, but OTSP were taller than ATSC plants until -0.6 MPa of water stress. The salinity experiment resulted in reduction on GP, GR and Height with increase in NaCl concentration. The OTSP plants results in increases on GI from 0.00 to 1.25 g of N L-1 of distil water and greater. Conversely, ATSC plants resulted in decreased GI with increased salinity. The CVG remained constant from 0.00 to 2.50 g of N L-1 of distil water in the ATSC population while OTSP population was reduced with increase in salinity. In the greenhouse experiment, differences among cultivars were not observed and the greatest tolerance for both populations was observed with atrazine, carfentrazone, diglycolamine, ethofumesate, foramsulfuron, mesotrione, pronamide, siduron, simazine, sulfentrazone, sulfosulfuron, and trifloxysulfuron. The metribuzin application was selective just for the ATSC population. Plant Height was influenced by the herbicide application while all tolerant herbicides do not influenced expressively. Carfentrazone was the only treatment similar to the nontreated in Fresh Mass 90% of nontreated fresh mass. Others treatments resulted in less Fresh Mass than carfentrazone and the nontreated."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Souza, G. S. F., J. S. McElroy, D. Martins, M. L. Flessner, and J. N. Toombs. 2013. Germination and herbicide response of carpetgrassĆ¢. South. Weed Sci. Soc. Proc. 66:p. 5.
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http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=92
    Last checked: 08/12/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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