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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2007.pdf#page=101
Last checked: 06/28/2013
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Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Compton, B. W.;
Askew, S. D. |
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| Author Affiliation: | Virginia Tech, Blacksburg |
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| Title: | Critical weed-free period for overseeded bermudagrass in northern climates |
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| Section: | Turfgrass and plant growth regulators
Other records with the "Turfgrass and plant growth regulators" Section
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| Meeting Info.: | Baltimore, Maryland: January 2-5, 2007 |
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| Source: | Proceedings of the Sixty-First Annual Meeting of the Northeastern Weed Science Society. Vol. 61, 2007, p. 83. |
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| Publishing Information: | Baltimore, Maryland: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Cynodon dactylon; Foramsulfuron; Growth regulator evaluation; Lolium perenne; Overseeding; Transition zone; Weed control
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| Cultivar Names: | Patriot; Midiron |
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| Trade Names: | Revolver |
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| Abstract/Contents: | "In the transition zone, it is common to overseed warm season bermudagrass (BG) (Cynodon dactylon) with cool season perennial ryegrass (PRG) (Lolium perenne) to improve winter aesthetics on golf courses. Most golf revenue is generated during spring and early summer due to ideal weather conditions. PRG is needed to provide desirable quality and playing conditions for fairway turf but competitively injures BG during this period. BG has the ability to recover from PRG competition given enough time during the summer. It has been suggested that healthy BG needs 100 days of weed-free growth in summer, yet research has not been conducted to validate or test this claim. "Healthy" BG is a subjective term that is usually based on biomass accumulation, total nonstructural carbohydrate (TNC), and ability of plants to survive stresses such as cold, heat, or UV light. Our objective is to measure how duration of PRG competition influences BG health. Studies were conducted in Blacksburg, VA on Patriot BG at VA Techs Glade Road Research Facility and on Midiron BG at the Turfgrass Research Center. Foramsulfuron (Revolver) at 17 oz/A, was applied at weekly intervals for 24 weeks between April 4 and August 29, 2006. To assess BG "health", BG and PRG cover was visually evaluated on September 29 and 80cm2 plugs of turf were collected from each plot on October 15 to assess dry biomass, TNC, and electrolyte leakage (following cold stress). Electrolyte leakage and TNC data are still being collected and will be discussed later. Data were subjected to analysis of variance using a repeated measures technique and regressions were used to describe effects of BG weed-free period on measured responses. Green shoots were evident on Patriot and Midiron BG on March 25 and April 6, respectively, and both cultivars stopped growing at first frost on October 1. Therefore, the greatest possible growing season was 178 to 190 days, depending on cultivar. However, growing degree days at base 65 (GDD65), the typical growth model for BG, were only accumulated between May 26 and September 24, a period of 121 days. PRG left to compete with BG beyond July 25 (less than 68 weed-free days) reduced BG visual cover 10 to 20% and 13 to 35% in Patriot and Midiron BG, respectively. As the duration of weed-free growth increased, BG above-ground dry biomass increased from 777 to 1322g/m2 for Patriot and 350 to 525g/m2 for Midiron. Patriot dry biomass increased linearly at a rate of 3g/m2 for each additional day of weed-free growth while Midiron biomass exhibited a hyperbolic response with an asymptote at approximately 89 days. This differential biomass accumulation indicates that Patriot continues to compete with ryegrass and grow during the entire season while Midiron does not. Thus, Midiron has a higher requirement for weed free period than Patriot. The 89-day asymptote for Midiron biomass accumulation represents 309 GDD65 out of a total of 621 GDD65 for the entire season. Although the TNC and electrolyte leakage data yet to be collected represent the most important indicators of BG health, we can tentatively conclude that 100 days of growth is a safe assumption for less competitive cultivars like Midiron but may be overly conservative for cultivars like Patriot." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Compton, B. W., and S. D. Askew. 2007. Critical weed-free period for overseeded bermudagrass in northern climates. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 61:p. 83. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2007.pdf#page=101
Last checked: 06/28/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 |
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