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Delaying Weed Control Lengthens the Anthesis-Silking Interval inMaize

Published online by Cambridge University Press:  20 January 2017

Andrew Reid ,
Victor Gonzalez ,
Peter H. Sikkema ,
Elizabeth A. Lee ,
Lewis Lukens  and
Clarence J. Swanton
Andrew Reid
Affiliation:
Department of Plant Agriculture, University of Guelph, 50 Stone Road E., Guelph, ON, N1G 2W, Canada
Victor Gonzalez
Affiliation:
Department of Plant Agriculture, University of Guelph, 50 Stone Road E., Guelph, ON, N1G 2W, Canada
Peter H. Sikkema
Affiliation:
Department of Plant Agriculture, Ridgetown Campus, Ridgetown, Ontario N0P 2C0
Elizabeth A. Lee
Affiliation:
Department of Plant Agriculture, University of Guelph, 50 Stone Road E., Guelph, ON, N1G 2W, Canada
Lewis Lukens
Affiliation:
Department of Plant Agriculture, University of Guelph, 50 Stone Road E., Guelph, ON, N1G 2W, Canada
Clarence J. Swanton*
Affiliation:
Department of Plant Agriculture, University of Guelph, 50 Stone Road E., Guelph, ON, N1G 2W, Canada
*
Corresponding author's E-mail: cswanton@uoguelph.ca
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Abstract

Stress caused by early weed competition is known to delay the rate of maizedevelopment which may result in a decrease in kernel number. Kernel numberin maize is correlated negatively with the length of the anthesis-silkinginterval (ASI). A short ASI has been identified as an easily measured,visual trait which may identify enhanced drought tolerance in maize. Fieldstudies were conducted to test whether: (1) delaying weed control wouldresult in a lengthening of ASI in both a drought tolerant and non-droughttolerant maize hybrid and (2) the presence of drought tolerance geneticscomes at a physiological cost, resulting in a greater yield reduction underweedy conditions. In this study, the response of a drought tolerant hybridwith its non-drought tolerant near-isoline was compared to seven differenttimings of weed control using wheat as a surrogate competitor. Resultsconfirmed that there was no treatment by hybrid interaction at any site–yrfor any of the parameters evaluated. Delaying weed control reduced plantheight, leaf tip number, shifted and reduced biomass accumulation, kernelnumber and grain yield and lengthened ASI for both hybrids. Although yieldlosses occurred with the delay in weed control timing, no yield differenceswere observed between hybrids suggesting that there was no additionalphysiological cost associated with the drought tolerant traits. The droughttolerant hybrid, however, was found to have a shorter ASI, lower kernelnumber and higher kernel wt compared to the non-drought tolerant hybrid.This study confirmed that delaying weed control can influence the length ofASI, which is an important drought tolerant trait. The lengthening of ASI byearly weed competition resulted in a rate of yield loss of 0.13 T ha−1 growing degree days (GDD)−1 when averagedacross both hybrids and all treatments.

Keywords

Maize, Zea mays LCorndrought tolerancekernel numberkernel wtreproductive developmentyield loss

Information

Type
Weed Management
Information
Weed Science , Volume 62 , Issue 2 , June 2014 , pp. 326 - 337
Copyright
Copyright © Weed Science Society of America 

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