Interaction of Cotton (Gossypium hirsutum) and Velvetleaf (Abutilon theophrasti) Plants for Water is Affected by Their Interaction for Light

Transpirations of cotton and velvetleaf plants competing for water and light were estimated with heat balance stem flow gauges in a controlled environment. Cotton and velvetleaf plants were grown together in pots and monitored during fluctuations in soil water, irradiance, air temperature, and humid...

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Bibliographic Details
Published in:Weed science 1993-01, Vol.41 (1), p.69-74
Main Authors: Salisbury, Clay D., Chandler, James M.
Format: Article
Language:English
Subjects:
ABSCISION
ABSCISSION
ABUTILON THEOPHRASTI
AGUA DEL SUELO
Clay soils
COMPETENCIA BIOLOGICA
COMPETITION BIOLOGIQUE
Cotton
COUVERT
CUBIERTA DE COPAS
EAU DU SOL
FEUILLE
GOSSYPIUM HIRSUTUM
HOJAS
HUMEDAD
HUMIDITE
Leaves
LUMIERE
LUZ
MALEZAS
MAUVAISE HERBE
MOUVEMENT
MOVIMIENTO
OMBRAGE
Plants
RELACIONES PLANTA AGUA
RELATION PLANTE EAU
Soil water
Soybeans
Stemflow
TEMPERATURA DEL AIRE
TEMPERATURE DE L'AIR
TRANSPIRACION
TRANSPIRATION
UMBRIA
Water consumption
Weed Biology and Ecology
Weeds
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Summary:Transpirations of cotton and velvetleaf plants competing for water and light were estimated with heat balance stem flow gauges in a controlled environment. Cotton and velvetleaf plants were grown together in pots and monitored during fluctuations in soil water, irradiance, air temperature, and humidity. Shading from other plants imposed light competition on velvetleaf or cotton. Velvetleaf used significantly more water than cotton given ample water and light. Transpiration by both species was reduced in dry soil, but velvetleaf transpiration was reduced primarily by leaf abscision, while cotton leaves did not abscise. Both cotton and velvetleaf plants transpired significantly less when shaded. Leaf water potentials indicated that shaded plants experienced reduced evaporative demand suggesting that shading reduced plant stress in dry soil. Competition for water was strongly influenced by competition for light.
ISSN:0043-1745
1550-2759
DOI:10.1017/S004317450005760X