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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Isgrigg, J. III;
Yelverton, F. H.;
Coble, H. D. |
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| Author Affiliation: | North Carolina State University, Raleigh, NC 27695 |
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| Title: | The effect of paclobutrazol on the relative growth of annual bluegrass and creeping bentgrass |
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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, January 1998, p. 248. |
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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: Paclobutrazol; Growth; Poa annua; Agrostis stolonifera; Comparisons; Application rates; Dry weight; Photosynthesis; Biomass
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| Abstract/Contents: | "Paclobutazol was evaluated in greenhouse experiments for differential suppression of a perennial type annual bluegrass [Poa annua ssp. reptans (Hausskn.) Timm.] and creeping bentgrass (Agrostis palustris L.) monoculture swards. Paclobutrazol treatments at rates of 0, 0.28, 0.4, and 0.6 kg ai/ha plus 0.3 g actual N/mĀ² soluble fertilizer were applied using a spray chamber calibrated to deliver 470 L/ha at 225 kPa. All pots received fertilizer solution drench at 0.3 g actual N/mĀ² weekly and were watered daily. Chlorothalonil was applied at 2.8 L/ha at 10 day intervals for disease prevention. Daily greenhouse temperatures averaged 30 degrees centigrade daytime and 11 degrees centigrade nighttime over the course of the experiment. Data for dry biomass (clipping weight), net ecosystem photosynthesis, shoot number, leaf area, and turf quality were collected. Only dry biomass and net canopy photosynthesis data will be reported. All treatments resulted in maximum dry biomass reductions of >30% for bentgrass and >40% for annual bluegrass. Photosynthesis rates for treated annual bluegrass were significantly lower than nontreated 2 WAT. Annual bluegrass biomass production was suppressed to 5 WAT at the 0.28 and 6 WAT for the highest 2 paclobutrazol treatment levels. Bentgrass biomass production was inhibited 1 to 3 WAT with all treated pots being equivalent to nontreated in weeks 4 and 5 and higher 6 WAT compared to nontreated and annual bluegrass. Paclobutrazol treatments resulted in lower overall net canopy photosynthesis for annual bluegrass from 1 to 4 WAT and significantly higher rates from 4 to 6 WAT. Treated bentgrass had a trend for lower photosynthesis rates between 1 and 3 WAT, however, reductions were not significant. Compared to nontreated bentgrass, treated bentgrass had significantly higher photosynthetic rates from 5 to 6 WAT. Paclobutrazol inhibited annual bluegrass photosynthesis rates and dry biomass more than bentgrass. This indicates paclobutrazol use in bentgrass/annual bluegrass putting greens can result in a competitive shift in favor of bentgrass by differentially inhibiting annual bluegrass and creeping bentgrass growth. Canopy architecture modifications caused by paclobutrazol are important in transitioning annual bluegrass out of bentgrass greens. Bentgrass growth increases 2 weeks sooner than annual bluegrass, enabling bentgrass to compete successfully with the normally aggressive annual bluegrass." |
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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):
Isgrigg, J. III, F. H. Yelverton, and H. D. Coble. 1998. The effect of paclobutrazol on the relative growth of annual bluegrass and creeping bentgrass. South. Weed Sci. Soc. Proc. 51:p. 248. |
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MSU catalog number: SB 611 .S6 v.51 |
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