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The Influence of Water Stress on the Physiology and Competition of Soybean (Glycine max) and Florida Beggarweed (Desmodium tortuosum)

Published online by Cambridge University Press:  12 June 2017

Blair S. Griffin ,
Donn G. Shilling ,
Jerry M. Bennett  and
Wayne L. Currey
Blair S. Griffin
Affiliation:
Univ. Florida, Gainesville, FL 32611
Donn G. Shilling
Affiliation:
Univ. Florida, Gainesville, FL 32611
Jerry M. Bennett
Affiliation:
Univ. Florida, Gainesville, FL 32611
Wayne L. Currey
Affiliation:
Univ. Florida, Gainesville, FL 32611
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Abstract

Replacement studies were conducted under greenhouse conditions to determine if available soil water influences the competitive interaction between soybean and Florida beggarweed. Stomatal conductance and leaf water potential were determined for both species under different levels of available soil water to identify possible mechanisms involved in changes in the relative competitiveness induced by the water deficits. Soybean leaf area and aboveground biomass were greater than for Florida beggarweed under optimum water, but equal to or less than Florida beggarweed with water stress. Soybean was more competitive than Florida beggarweed when there was adequate soil water but less competitive than Florida beggarweed under water stress. Stomatal conductance was higher for soybean with optimum soil water (at high leaf water potentials) but equal to Florida beggarweed as soil water became limiting (low leaf water potentials). These data indicated that water stress differentially affected soybean and Florida beggarweed.

Keywords

Soybean, Glycine max (L.)MerrFlorida beggarweed, Desmodium tortuosum (SW.) DC ♯3 DEDTOStomatal conductancecompetitionreplacement series studyleaf water potentialDEDTO
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 37 , Issue 4 , July 1989 , pp. 544 - 551
Copyright
Copyright © 1989 by the Weed Science Society of America 

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