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Preharvest Applications of Glyphosate Affect Emergence and Seedling Growth of Field Pea (Pisum sativum)

Published online by Cambridge University Press:  20 January 2017

Mirza N. Baig ,
A. Lloyd Darwent ,
K. Neil Harker  and
John T. O'Donovan
Mirza N. Baig*
Affiliation:
Monsanto Canada Inc., Edmonton, AB, Canada T6M 1V7
A. Lloyd Darwent
Affiliation:
Agriculture and Agri-Food Canada, Beaverlodge, AB, Canada TOH 0C0
K. Neil Harker
Affiliation:
Agriculture and Agri-Food Canada, Lacombe, AB, Canada T4L 1W1
John T. O'Donovan
Affiliation:
Agriculture and Agri-Food Canada, Beaverlodge, AB, Canada TOH 0C0
*
Corresponding author's E-mail: mnbaig@telusplanet.net
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Abstract

Field experiments were conducted in 1994 and 1995 at Vegreville, Legal, and Lacombe, AB, to determine the effects of a preharvest application of glyphosate on seedling emergence and growth of field pea. Glyphosate was applied at 0.9 kg ai/ha at each of the three crop development stages, as determined by seed moisture content (SMC), to determinate (‘Ascona’ and ‘Radley’) and indeterminate (‘Miko’ and ‘Trapper’) cultivars. Applying glyphosate when the SMC was less than 30% had little to no effect on seedling emergence but reduced seedling shoot fresh weight in two of six experiments. Applying glyphosate at SMC above 40% reduced seedling emergence and shoot fresh weight in two and three of the six experiments, respectively. Reductions in seedling emergence and shoot fresh weight were greater from seeds collected from the top than from seeds collected from the bottom one-third of sprayed plants. Differences in response between determinate and indeterminate cultivars occurred, but there was no consistent trend. Given the variable maturity in most fields and on individual pea plants, applications of preharvest glyphosate to peas destined for seed production may decrease seed germination and biomass accumulation.

Keywords

Glyphosatefield pea, Pisum sativum L. ‘Ascona’, ‘Miko’, ‘Radley’, ‘Trapper’Crop desiccationdeterminate and indeterminate pea cultivarsharvest aidSMC, seed moisture content
Type
Research
Information
Weed Technology , Volume 17 , Issue 4 , December 2003 , pp. 655 - 665
Copyright
Copyright © Weed Science Society of America 

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