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Influence of barnyardgrass (Echinochloa crus-galli) time of emergence and density on corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Aca C. Bosnic  and
Clarence J. Swanton
Aca C. Bosnic
Affiliation:
Department of Crop Sciences, University of Guelph, Guelph, ON, Canada N1G 2W1
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Abstract

Barnyardgrass is a serious weed problem in cornfields in Ontario. Field experiments were conducted at two locations in 1994 and 1995 to determine the influence of emergence time and barnyardgrass density on corn yield loss, leaf area at 50% silking, and barnyardgrass seed production. Selected barnyardgrass densities up to 200 plants m−1 were established within 12.5 cm on either side of the corn row. Barnyardgrass seeds were planted concurrently with corn and at the 3- to 5- or 1- to 2-leaf stage of corn growth in 1994 and 1995, respectively. Barnyardgrass density and seedling emergence relative to corn influenced the magnitude of corn yield loss. Maximum corn grain yield loss ranged from 26 to 35% for early emerging barnyardgrass, and less than 6% yield loss occurred from barnyardgrass seedlings emerging later than the 4-leaf stage of corn growth. Changes in corn leaf area index at 50% silking reflected the level of barnyardgrass competition in corn. Maximum leaf area reduction ranged from 21 to 23%. Barnyardgrass seed production varied with time of seedling emergence and density. Ten barnyardgrass plants emerging up to the 3-leaf stage of corn growth produced 14,400 to 34,600 seeds m−2 compared to only 1,200 to 2,800 seeds m−2 from plants emerging after the 4-leaf corn stage. The results of this study are essential in the development of an integrated weed management strategy for corn.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGcorn, Zea mays L. ‘Pioneer 3902’Integrated weed managementinterferencetime of emergenceweed densityweed seed yieldyield lossECHCG
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 2 , April 1997 , pp. 276 - 282
Copyright
Copyright © 1997 by the Weed Science Society of America 

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