Full TGIF Record # 84958
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Web URL(s):http://www.bioone.org/bioone/?request=get-document&issn=0043-1745&volume=051&issue=01&page=0028
    Last checked: 11/2005
    Access conditions: Item is within a limited access website
Publication Type:
i
Refereed
Author(s):Ferrell, Jason A.; Earl, Hugh J.; Vencil, William K.
Author Affiliation:Department of Crop and Soil Sciences, University of Georgia, Athens, Georgia
Title:The effect of selected herbicides on CO2 assimilation, chlorophyll fluorescence, and stomatal conductance in johnsongrass (Sorghum halepense L.)
Section:Physiology, chemistry, and biochemistry
Other records with the "Physiology, chemistry, and biochemistry" Section
Source:Weed Science. Vol. 51, No. 1, January/February 2003, p. 28-31.
Publishing Information:Champaign, IL: Weed Science Society of America
# of Pages:4
Keywords:TIC Keywords: Herbicides; Carbon dioxide; Chlorophyll fluorescence; Stomatal conductance; Sorghum halepense; Herbicide application; Competition; Nicosulfuron; Imazapic; Clethodim; Glyphosate; Photosynthesis
Abstract/Contents:"Greenhouse studies were initiated to determine the duration of time after herbicide treatment required to render johnsongrass physiologically noncompetitive. Nicosulfuron, imazapic, clethodim, and glyphosate were applied to rhizomatous johnsongrass at 35, 70, 140, and 840 g ai ha-1, respectively. Net carbon assimilation, stomatal conductance, chlorophyll meter readings, and maxiumum (dark adapted) efficiency of photosystem II were measured. Net carbon assimilation (AN) was assumed to be the best indicator of johnsongrass competitiveness. Johnsongrass was considered to be physiologically noncompetitive when AN declined below 50% of that of nontreated check. From these data, it was concluded that glyphosate rendered johnsongrass noncompetitive most readily, 4.3 d after treatment, whereas no differences were detected between nicosulfuron, imazapic, or clethodim throughout the experiment. Stomatal conductance (gs) was highly correlated to AN and was determined to be an adequate substitute for AN when determining johnsongrass competitiveness. It was concluded that chlorophyll meter readings and photosystem II efficiency were poor indicators of johnsongrass competitiveness."
Language:English
References:19, 5 Notes
Note:Figures
Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ferrell, J. A., H. J. Earl, and W. K. Vencil. 2003. The effect of selected herbicides on CO2 assimilation, chlorophyll fluorescence, and stomatal conductance in johnsongrass (Sorghum halepense L.). Weed Sci. 51(1):p. 28-31.
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Web URL(s):
http://www.bioone.org/bioone/?request=get-document&issn=0043-1745&volume=051&issue=01&page=0028
    Last checked: 11/2005
    Access conditions: Item is within a limited access website
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MSU catalog number: SB 610 .W38
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