Late Glyphosate Applications Alter Yield and Yield Components in Glyphosate-Resistant Canola (Brassica napus)

Eric Tozzi; K. Neil Harker; Robert E. BlackshawJohn T. ODonovanStephen E. StrelkovChristian J. Willenborg

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Late Glyphosate Applications Alter Yield and Yield Components in Glyphosate-Resistant Canola (Brassica napus)

机译：Late Glyphosate Applications Alter Yield and Yield Components in Glyphosate-Resistant Canola (Brassica napus)

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The development of glyphosate-resistant canola has provided improved weed-management options for growers, but crop tolerance to glyphosate may be inadequate at later growth stages. In this study, glyphosate-resistant canola 45H28 (RR) was used to determine the effects of glyphosate application timing on yield and yield components at several sites in western Canada. Canola received a single glyphosate applications at the two-leaf, six-leaf, bolting, and early bloom stages and sequential applications at the two-leaf + six-leaf, two-leaf + bolting, and two-leaf + early bloom stages. Contrasts were made between early vs. late, single vs. sequential, and on-label (two to six-leaf stage) vs. off-label (above six-leaf stage). In general, differences between application timings were observed for yield and yield components in 3 of 8 site-yr. Off-label applications of glyphosate (later than six-leaf) significantly decreased yield, seeds per pod, and increased thousand-seed weight and aborted pods in canola at the Lethbridge and St. Albert locations. Increased glyphosate translocation because of adequate, but not excessive, moisture to new growth may have suppressed new seed formation and encouraged pod abortion at the time of application in the 2010 and 2011 seasons. Results from this experiment demonstrate the importance of proper application timing of glyphosate on canola and can help better predict the effects of late applications.

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《Weed technology: A journal of the Weed Science Society of America》 |2015年第4期|675-683|共9页
作者
Eric Tozzi; K. Neil Harker; Robert E. BlackshawJohn T. ODonovanStephen E. StrelkovChristian J. Willenborg;
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作者单位

Postdoctoral Scholar and Assistant Professor, Department of Plant Science, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada;

Department of Agricultural, Life, and Environmental Sciences, University of Alberta 2-14 Agriculture Forestry Centre St., Albert, AB T6G 2P5, Canada;

Weed Scientist, Agriculture and Agri-Food Canada, 5403-1 Avenue South, Lethbridge, Alberta T1J 4B1;

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正文语种英语
中图分类植物保护;
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Application timing; late; sequential; yield; seeds; pod; aborted.;

Late Glyphosate Applications Alter Yield and Yield Components in Glyphosate-Resistant Canola (Brassica napus)

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