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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Reynolds, J. H.;
Krueger, W. A.;
Walker, C. L. |
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| Author Affiliation: | Department of Plant & Soil Science, University of Tennessee, Knoxville, TN |
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| Title: | Effects of clethodim on tall fescue |
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| Meeting Info.: | Little Rock, AR; January 21-22, 1992 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 45, January 1992, p. 140. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Festuca arundinacea; Clethodim; Seedheads; Forage
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| Abstract/Contents: | "Some plant growth regulators (PRGs) have been shown to reduce seedhead production and improve forage quality in cool-season grasses. Clethodim (Select) was applied to a 15-year old stand of tall fescue to find the effects of application timing (fall, early spring, mid-spring), rate (0, 5.6, 11.2, or 22.4 g ai/ha), and use of crop oil (2.3 L/ha or none) for three years. In each year, increasing clethodim rate reduced seedhead density and forage yield. There was no effect of application date in 1988 and 1990, but seedhead density and forage yield decreased from the November to the March application date in 1989. Adding crop oil reduced seedheads and yield in each year. Some discoloration and necrosis were visible in treatments that were the most effective in suppressing seedheads. Increasing clethodim rate was not consistent in increasing WSC (water soluble carbohydrates), but generally decreased NDF (neutral detergent fiber) and increased CP (crude protein). The combination of later treatment dates, higher rates of clethodim, and addition of crop oil generally caused the greatest improvements in these forage quality constituents. There were few residual effects on the regrowth harvested in June or July. After a year without treatments, yields and seedheads produced in 1991 showed no effects of the clethodim treatments applied in the previous years. Reductions in seedhead density obtained with increasing rates of clethodim and addition of crop oil were generally greater than improvements in forage quality. Seedhead density was reduced 68% by the highest rate of clethodim (3-year average) while NDF was decreased 6% and CP was increased 18%. Forage yield was reduced an average of 25%. Effects of application date were not as consistent as were clethodim rate and addition of crop oil." |
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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):
Reynolds, J. H., W. A. Krueger, and C. L. Walker. 1992. Effects of clethodim on tall fescue. South. Weed Sci. Soc. Proc. 45:p. 140. |
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MSU catalog number: SB 611 .S6 |
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