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Response of Cotton (Gossypium hirsutum) to Coastal Bermudagrass (Cynodon dactylon) Density in a No-tillage System

Published online by Cambridge University Press:  12 June 2017

William K. Vencill ,
Luis J. Giraudo  and
George W. Langdale
William K. Vencill
Affiliation:
Dep. Agron., Univ. Georgia, Athens, GA 30602 and South. Piedmont Res. Ctr., Watkinsville, GA 30677
Luis J. Giraudo
Affiliation:
Dep. Agron., Univ. Georgia, Athens, GA 30602 and South. Piedmont Res. Ctr., Watkinsville, GA 30677
George W. Langdale
Affiliation:
Dep. Agron., Univ. Georgia, Athens, GA 30602 and South. Piedmont Res. Ctr., Watkinsville, GA 30677
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Abstract

Field experiments were established in 1989 and 1990 at the Southern Piedmont Conservation Research Center near Watkinsville, GA, to determine effects of coastal bermudagrass density on cotton in a conservation tillage system. Cotton height, canopy width, leaf area indices, and seed cotton yields were determined at coastal bermudagrass densities of 0 to 3600 kg ha−1 as achieved by herbicide inputs. Soil water measurements were recorded in cotton plots with a range of coastal bermudagrass densities using time domain reflectometry. Cotton growth and yields were reduced by coastal bermudagrass competition both years of the study. At the highest coastal bermudagrass density of 3600 kg ha−1, cotton height was reduced compared to cotton alone as early as 5 wk after planting. Seed cotton yields were reduced 25% at the highest coastal bermudagrass densities both years of the study. At the 15-cm soil depth, coastal bermudagrass significantly reduced soil water in cotton. Soil water in cotton at 30, 45, and 60 cm was not affected by coastal bermudagrass.

Keywords

Coastal bermudagrass, Cynodon dactylon L. # CYNDAcotton, Gossypium hirsutum L. ‘Coker 315’Conservation tillagesoil moisture relationsgrowth analysistime domain reflectometryweed competitionCYNDA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 40 , Issue 3 , September 1992 , pp. 455 - 459
Copyright
Copyright © 1992 by the Weed Science Society of America 

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