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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=470
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Yelverton, F. H.;
Hoyle, J. A.;
Gannon, T. W.;
Warren, L. S. |
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| Author Affiliation: | North Carolina State Univ., Raleigh, NC |
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| Title: | Plant counts, digital image analysis, and visual ratings for estimating weed control in turf: Are they correlated? |
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| Section: | Turf and ornamentals
Other records with the "Turf and ornamentals" Section
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| Meeting Info.: | Orlando, Florida: February 9-12, 2009 |
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| Source: | 2009 Proceedings, Southern Weed Science Society. Vol. 62, 2009, p. 400. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Digitaria sanguinalis; Festuca arundinacea; Herbicide efficacy; Image analysis; Mowing height
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| Abstract/Contents: | "Herbicide efficacy research trials in turfgrass commonly report data based on visual estimates. There has been much interest recently in determining how accurate and consistent visual estimates may be, relative to other techniques. Other evaluation methodology includes line intersect analysis (LIA) and digital imaging analysis (DIA), among others. Field experiments were conducted during 2007 and 2008 at two locations (Jackson Springs and Raleigh, NC) to determine if tall fescue (Lolium arundinaceum) mowing height could suppress large crabgrass (Digitaria sanguinalis) populations. The Raleigh location consisted of an Appling fine sandy loam and the Jackson Springs location consisted of a Candor sand. Large crabgrass was purchased from Okeen, Oklahoma and seeded in each experiment in early March. Evaluated tall fescue mowing heights included 2.5, 5.1, 7.6 or 10.2 cm, which were initiated once soil temperatures reached an optimum (13C) for crabgrass emergence. Visual rating (VR), DIA and LIA were used to determine percent crabgrass cover in mid-September at each location and statistics were completed to determine their correlation. In 2007, no significant differences were observed between VR and DIA (P-value = 0.131) and VR and LIA (P-value = 0.392). In 2008, there were no significant differences between VR and DIA (P-value = 0.725) and VR and LIA (P-value = 0.471). Regression analysis of VR values against DIA or LIA values were also conducted for 2007 and 2008. In 2007, VR versus DIA expressed a slope of 0.89 and R2 value of 0.99, VR versus LIA R2 = 0.99 with a slope of 0.84. In 2008, VR versus DIA expressed a slope of 0.84 and a R2 value of 0.99, VR versus LIA R2 = 0.99 with a slope of 0.83. These results demonstrate evaluated rating methods are highly correlated and may allow VR to become more widely accepted." |
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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):
Yelverton, F. H., J. A. Hoyle, T. W. Gannon, and L. S. Warren. 2009. Plant counts, digital image analysis, and visual ratings for estimating weed control in turf: Are they correlated?. South. Weed Sci. Soc. Proc. 62:p. 400. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=470
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: b2207931 |
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Digitally in TIC by file name: swssp2009 |
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