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Interference and Water Use of Biotypes Differing in Sensitivity to MSMA

Published online by Cambridge University Press:  12 June 2017

M. Raisuddin Akanda
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., Auburn, AL 36849
Robert H. Walker
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., Auburn, AL 36849
Glenn Wehtje
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., Auburn, AL 36849

Abstract

Biotypes of common cocklebur were identified, which were assumed to differ only with respect to sensitivity to MSMA. Water use of these biotypes when grown as isolated plants in a growth chamber was determined with stem flow gauges. The MSMA-tolerant biotype exhibited less whole-plant sap flow at media moisture levels above 17%. Furthermore, only in the tolerant biotype did sap flow differ between the upper and lower canopy; the upper canopy had greater sap flow. Field experiments were conducted to compare growth parameters, water use and competitive ability toward cotton of the MSMA-sensitive and -tolerant biotypes. Sensitive biotype plants were taller and had greater leaf area than those of the tolerant biotype; dry weight was equivalent. The tolerant biotype used less water and reduced seed cotton yield more than the sensitive biotype.

Type
Weed Biology and Ecology
Copyright
Copyright © 1996 by the Weed Science Society of America 

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