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Plant Water Stress of Soybean (Glycine max) and Common Cocklebur (Xanthium pensylvanicum): A Comparison Under field Conditions

Published online by Cambridge University Press:  12 June 2017

H. D. Scott  and
R. D. Geddes
H. D. Scott
Affiliation:
Dep. Agron., Univ. of Arkansas, Fayetteville, AR 72701
R. D. Geddes
Affiliation:
Dep. Agron., Univ. of Arkansas, Fayetteville, AR 72701
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Abstract

The study was conducted to determine the seasonal and diurnal water stress of soybeans [Glycine max (L.) Merr. ‘Lee 74′] grown under intraspecific competition (competition between plants of the same species) and interspecific competition (competition between plants of different species) with common cocklebur (Xanthium pensylvanicum Wallr.). Midday xylem potentials decreased as the season progressed and were lower in common cocklebur during vegetative growth of soybean and in soybean during reproductive growth. For a given species differences in xylem potential due to mode of competition were small. In the diurnal studies xylem potential for each species decreased to a minimum in the early afternoon but recovered to the original pre-dawn values at night. As the season progressed leaf xylem potential (a) decreased at a greater rate, (b) decreased sooner in the day, and (c) recovered at a slower rate. It was shown that differences in xylem potential between soybean and common cocklebur on a given day were small. Greater diffusive resistance values generally were found with soybean than with common cocklebur and with each species grown under interspecific competition.

Keywords

Xylem potential diffusiveresistanceintraspecific competitioninterspecific competition
Type
Research Article
Information
Weed Science , Volume 27 , Issue 3 , May 1979 , pp. 285 - 289
Copyright
Copyright © 1979 by the Weed Science Society of America 

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