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Effect of Interspecific Interference, Light Intensity, and Soil Moisture on Soybean (Glycine max), Common Cocklebur (Xanthium strumarium), and Sicklepod (Cassia obtusifolia) Water Uptake

Published online by Cambridge University Press:  12 June 2017

Ronald E. Jones Jr.  and
Robert H. Walker
Ronald E. Jones Jr.
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
Robert H. Walker
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
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Abstract

Greenhouse and growth chamber experiments with potted plants were conducted to determine the effects of interspecific root and canopy interference, light intensity, and soil moisture on water uptake and biomass of soybean, common cocklebur, and sicklepod. Canopy interference and canopy plus root interference of soybean with common cocklebur increased soybean water uptake per plant and per unit leaf area. Root interference with soybean decreased common cocklebur water uptake per plant. Canopy interference of soybean with sicklepod increased soybean water uptake per unit leaf area, while root interference decreased uptake per plant. Combined root and canopy interference with soybean decreased water uptake per plant for sicklepod. Soybean leaf area and shoot weight were reduced by root interference with both weeds. Common cocklebur and sicklepod leaf area and shoot weight were reduced by root and canopy interference with soybeans. Only common cocklebur root weight decreased when canopies interfered and roots did not. The relationship between light intensity and water uptake per unit leaf area was linear in both years with water uptake proportional to light intensity. In 1991 water uptake response to tight was greater for common cocklebur than for sicklepod. The relationship between soil moisture level and water uptake was logarithmic. Common cocklebur water uptake was two times that of soybean or sicklepod at −2 kPa of pressure potential. In 1991 common cocklebur water uptake decreased at a greater rate than soybean or sicklepod in response to pressure potential changes from −2 to −100 kPa.

Keywords

Common cocklebur, Xanthium strumarium L. # XANSTsicklepod, Cassia obtusifolia L. # CASOBsoybean, Glycine max (L.) Merr.Interferencewater relationsXANSTCASOB
Type
Weed Biology and Ecology
Information
Weed Science , Volume 41 , Issue 4 , December 1993 , pp. 534 - 540
Copyright
Copyright © 1994 by the Weed Science Society of America 

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