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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Lowe, D. B.;
Whitwell, T.;
McCarty, L. B. |
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| Author Affiliation: | Department of Horticulture, Clemson University |
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| Title: | Mowing and nitrogen influence Green Kyllinga (Kyllinga brevifolia) in bermudagrass turf. |
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| Meeting Info.: | 51st Annual Meeting, Birmingham, AL, January 26-28, 1998 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 51, 1998, p. 71-72. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Kyllinga brevifolia; Weed control; Mowing height; Nitrogen fertilization; Cynodon dactylon; Cynodon transvaalensis; Application rates; Seeding; Vegetative propagation; Weed infestation
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| Abstract/Contents: | "Green Kyllinga (Kyllinga brevifolia) is becoming more problematic in turfgrass within the Southeast. Green Kyllinga spreads by stolons and seeds. Several herbicides provide partial suppression of Green Kyllinga, however, a holistic approach to weed management must occur for long-term control. Maintenance practices, such as mowing and fertility, may be manipulated to benefit turf growth over weed growth. Tifway bermudagrass (Cynodon dactylon X C. transvaalensis) is a crop which Green Kyllinga often infests. Research was conducted in 1997 in Clemson, SC with the objectives to determine if mowing heights and nitrogen rates could be manipulated to discourage Green Kyllinga in Tifway bermudagrass. The study was a randomized complete block design. Treatments included 3 nitrogen rates (0, 24, 49 kg N/ha/month), 2 mowing heights (2.5, 5.0 cm) and seed vs. stolon establishment. Plots were 2 X 2m each containing 5 subsamples. Four repetitions were utilized. The turfgrass research area was core aerated and verticut prior to initiation. Also, soil was analyzed and amended to provide adequate phosphorus and potassium levels for bermudagrass nutrition (nitrogen was not applied because treatments consisted of nitrogen rates). Five turf cores (24 cm² X 7.5 cm depth/each) were removed from each plot in May, 1997 and soil was replaced to original levels. Then, 5 shoots were placed into each subsample for stolon establishment or 100 seeds were sowed into each subsample for seed establishment followed by a light sand topdressing. Beginning in June, plots were mowed with a rotary walk mower 2 to 3 times weekly until October. To the appropriate plots, ammonium nitrate was applied with a shaker can on June 23 and continued twice monthly until September 18. At 16 weeks, infestation area of each subsample was calculated by tracing subsamples onto plastic sheets. The plastic sheets were then photo-copied onto paper and the traced patches were cut out. The paper cut-outs were then analyzed throught a leaf area meter. Also, one subsample from each plot (506 cm² X 10 cm depth/each) was extracted. Cores were washed and Kyllinga plants were removed and counted. Nitrogen rates did not significantly influence stolon established Kyllinga infestation; however, both nitrogen rates decreased Kyllinga seed establishment at the 2.5 mowing height versus no nitrogen. Compared to seed established plots which did not receive nitrogen, plots which received nitrogen had 58 to 75% less shoots/506 cm² and infested 53 to 63% less area. Nitrogen did not influence stolon established Kyllinga infestations. Mowing heights influenced infestation of seed and stolon established Kyllinga. Seed established subsamples fertilized t 24 kg N/ha/month and mowed at 2.5 cm had more shoots/area (221 shoots/506 cm²), compared to plots mowed at 5.0 cm (117 shoots /506 cm²) by 16 weeks. Likewise, stolon established subsamples fertilized at 24 kg N/ha/month and mowed at 2.5 cm had more shoots/area (166 shoots/506 cm²), compared to plots mowed at 5.0 cm (40 shoots/506 cm²) by 16 weeks. Infested area of seed established subsamples fertilized at 24 kg N/ha/month and mowed at 2.5 cm was larger (89 cm²) at 16 weeks, compared to plots mowed at 5.0 cm (52 cm²). Also, infested area of stolon established subsamples fertilized at 24 kg N/ha/month and mowed at 2.5 cm was larger (149 cm²) at 16 weeks, compared to plots mowed at 5.0 cm (38 cm²)." |
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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):
Lowe, D. B., T. Whitwell, and L. B. McCarty. 1998. Mowing and nitrogen influence Green Kyllinga (Kyllinga brevifolia) in bermudagrass turf.. South. Weed Sci. Soc. Proc. 51:p. 71-72. |
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MSU catalog number: SB 611 .S6 v.51 |
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