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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=317
Last checked: 07/16/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Hutto, K. C.;
Shaw, D. R.;
Coats, G. E. |
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| Author Affiliation: | Department of Plant and Soil Sciences, Mississippi State University, Mississippi State |
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| Title: | Differentiation of turfgrass stress with hyperspectral radiometry |
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| Section: | Application technology
Other records with the "Application technology" Section
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| Meeting Info.: | Houston, Texas: January 27-29, 2003 |
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| Source: | Proceedings: Southern Weed Science Society: 56th Annual Meeting. Vol. 56, 2003, p. 230. |
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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: Comparisons; Evaluations; Hyperspectral radiometry; Stress factors; Stress response
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| Abstract/Contents: | "Turfgrass stress is an issue golf course superintendents want to avoid. Unfortunately, stress is a daily factor in golf course management. Every time turf is mowed, it is exposed to some degree of stress because it is being prohibited from doing what is natural, growing. There are numerous biotic and abiotic stresses that superintendents must manage. Constant monitoring of soil fertility, irrigation management, and soil compaction are some of these factors. Biotic stresses such as disease, insect control, and the accumulation of thatch also need to be carefully managed to prevent plant death. These factors can result in thinning of the turfgrass canopy and further problems such as weed infestation. Temperature, foot traffic/machine traffic, and chemical applications can also cause undesired stress to turfgrass. Research was performed in the summer of 2002 to identify specific spectral characteristics of stressed turfgrass, different turfgrass and weed species using hyperspectral radiometry. The stress treatments were simulated traffic, herbicide application, and drought stress. The traffic treatment was simulated by using a hydraulic-driven barrel traffic simulator at three different treatment levels. The MSMA treatment was applied at 2 lb ai/A every ten days, while Trimec Classic was applied at 3 qt/A every 3 weeks. Rain shelters were constructed and placed on individual plots to induce drought stress. An overall classification accuracy of 71% was obtained for all turfgrass stresses; with drought stress being the most accurately classified (98%) using 778 to 805 nm. When the MSMA and Trimec treatments were compared to the drought treatment, overall classification accuracies were 93 and 87%, respectively, using 746 to 760 nm. Low classification accuracies were obtained when comparing high-level stress to low-level stress (55%), and MSMA to Trimec (57%). Reflectance from turfgrass and weed species were also analyzed to determine separability of species. These species were bermudagrass [Cynodon dactylon (L). Pers. x transvaalensis Burtt- Davy], St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze], centipedegrass [Eremochloa ophiuroides (Munro) Hack.], zoysiagrass (Zoysia japonica L.), crabgrass [Digitaria ciliaris (Retz.) Koel.], dallisgrass (Paspalum dilatatum Poir.), eclipta (Eclipta prostrata L.), and Virginia buttonweed (Diodia virginiana L.). An overall classification accuracy of 87% was obtained for all plant species using 350 to 390 nm. When comparing St. Augustinegrass to crabgrass or dallisgrass, classification accuracies were 92 or 82%, respectively. However, when comparing crabgrass to dallisgrass, the accuracy decreased to 68%. Eclipta was classified 100% compared to Virginia buttonweed. The spectral range of 350 to 362 nm was used to obtain accuracies for dallisgrass (95%) and crabgrass (88%), compared to bermudagrass." |
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| Language: | English |
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| References: | 0 |
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| Note: | "Invasive weeds: Real or imagined threat?"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hutto, K. C., D. R. Shaw, and G. E. Coats. 2003. Differentiation of turfgrass stress with hyperspectral radiometry. South. Weed Sci. Soc. Proc. 56:p. 230. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=317
Last checked: 07/16/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: b2207931 |
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