The Effect of Pre-harvest Glyphosate on Quality of Milling Oats - Final Report: May 1, 2016 to December 1, 2019

Sep 17, 2026

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Final report documenting the effect of pre-harvest glyphosate on milling oat quality across multiple site-years between May 1, 2016 and December 1, 2019. Glyphosate desiccation was evaluated at different seed moisture contents and compared with swathing, using a RCBD with replicated plots at Kernen and Goodale research farms. The study quantified desiccation progress via AUDPC and measured yield, seed physical traits, test weight, plump/thin kernels, and dehulling and milling outcomes including milling yield and groat characteristics to assess functional seed quality.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages48

Reading Time2 h 1 min

AccessFree to download

Project information

Reporting period and team

Project activities during the reporting period

Experiment 1: Study design and treatments

Objective and location/site-years

Factors, timing, and harvest methods

Experimental design and agronomic management

Measurements and quality assessment

Desiccation ratings and AUDPC

Seed harvest, drying, and physical/functional tests

Dehulling and milling quality

| 1. ADF file number, Project title, and reporting period. | | --- | | ADF File \#: 20150338. Title: The Effect of Pre-harvest Glyphosate on Quality of Milling Oats Reporting Period: Final Report: May 1, 2016 to December 1, 2019
Dr. Chris Willenborg, Dr. Nancy Ames, Eric Johnson, Moria Kurtenbach, Sid Darras | | 2. Specify project activities undertaken during this reporting period. | | Oat (Avena sativa L.) is an important cereal crop in western Canada. From 2015 to 2017, 1 295 700 ha (i.e.
3 201 739 acres) were seeded to oat in Saskatchewan and total production during those years averaged 3.4 tonnes ha-1 (Statistics Canada, 2018a) . From January 1 to December 31, 2017 Canada exported a total of 1 527 358 tonnes of oat (Statistics Canada, 2018b) . Harvest aids and desiccants can be an effective tool to improve crop quality and harvest efficiency by reducing or eliminating the presence of actively growing weeds, and enhancing the dry down of the crop (Griffin et al. 2010; Yenish and Young 2000) . Glyphosate is a nonselective systemic herbicide that can be very effective as a desiccant when applied appropriately. In corn (Zea mays L.), glyphosate should only be applied as a desiccant when the grain moisture if 35% or less and when the crop is physiologically mature (Griffin et al. 2010). While glyphosate can provide very effective dry-down, if applied too early it can affect seed quality and germination (Yenish and Young 2000) . Since glyphosate translocates from sources to sinks within the plant, it is possible that the herbicide will end up in the grain after application in minimal amounts. This detection can cause concern regarding consumption of such products and their use in processing.
a.) Methodology: Include approaches, experimental design, tests, materials, sites, etc. Please note that any significant changes from the original work plan will require written approval from the Ministry.
Experiment 1: Effect of pre-harvest glyphosate application timing on oat yield and seed physical and functional qualities.
The objective of this research was to examine the effect of glyphosate applied at various seed moisture content on seed quality, and to compare this with swathing treatments conducted at the same timing. This experiment was conducted at two locations in 2016, 2017, and 2018: Kernen Research Farm (clay loam soil) and Goodale Research Farm (loam soil) . The experiment consisted of two factors: harvest method (pre-harvest glyphosate @ 900 g ai ha-1 and swathing) and timing (60, 50, 40, 30, and 20% seed moisture content (SMC) . There was also a direct harvested check that was harvested at 12.5 % SMC. In 2016, 39 mm of rain fell 10 days prior to the first application timing at Kernen resulting in the missing of the 60, 50 and 40% SMC treatments. In all other site years, treatments were applied at the appropriate time. The experimental design was a RCBD with 4 replicates and plot size was 4m wide x 8m long. Oat (cv. AC Morgan) was seeded at 350 seeds m-2 in May on canola and wheat stubble at the Goodale and Kernen sites, respectively. Specific dates for field operations can be found in Tables 1, 2 and 3. Experimental areas received a pre-seed application of glyphosate @ 675 g ae ha-1. Fertilizer was applied based on soil test recommendations to achieve a target yield of 5900 kg ha-1. StellarTM (florasulm + fluroxypyr + MCPA ester) and CurtailTM M (clopyralid + MCPA ester) were applied at labelled rates at Kernen and Goodale, respectively to control broadleaf weeds. Priaxor® was applied to control leaf diseases when pressure warranted application. Swath treatments were cut with a 4.2 m swather at the inidciated seed moisture contents. Visual ratings of desiccation progress were made at 3, 7, 14, and 21 days | after application (DAA) based on the Canadian Weed Science Society 0 to 100 rating scale. On this scale, 80% represents commercially acceptable weed control, whereas 70 to 80% represents commercially acce

FAQs

What was the main objective of the research?

To examine how glyphosate applied at various seed moisture contents affects oat seed quality, and to compare it with swathing treatments at the same timings.

How were desiccation effects quantified during the experiment?

Desiccation progress was rated at multiple days after application (3, 7, 14, and 21 DAA) and converted into an area under the desiccant progress curve (AUDPC) value.

What treatments and factors were tested in the main experiment?

Two harvest methods (pre-harvest glyphosate at a specified rate and swathing) were tested across multiple timing levels based on seed moisture content, plus a direct harvested check.

Sep 17, 2026

Uploaded by Putri

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