Submitting Grain Samples for Grading

It is important to know the grade and dockage of your grain prior to marketing to ensure that you receive a fair price for your grain. The Canadian Grain Commission (CGC) provides the following grain grading services:

The Canadian Grain Commission’s Harvest Sample Program
The Harvest Sample Program provides unofficial grade and quality results at no charge for most grain, oilseed, and pulse crops.  Samples are submitted at harvest time and results are emailed to the producer.  Producers who have previously signed up for the Harvest Sample Program will receive a Harvest Sample kit annually.  For more information on the Harvest Sample Program or to sign up visit the CGC website.

Producer Request for Inspection Services
Producers that did not participate in the Harvest Sample Program but would still like to receive a grade for their grain can submit a sample to the CGC for a fee.  It is important to submit a representative grain sample as the grade received should accurately represent grain stored in a bin.  Instructions on representative grain sampling can be found on the CGC website.  Once you have a representative sample, complete the request for inspection services form I-106 and send the sample by mail or courier to the CGC Weyburn office for inspection.  Instructions and additional tests available are found on the form.

What steps can be taken when you disagree with an elevator’s assessment of your grain’s grade and dockage?
As legislated under the Canadian Grains Act producers can dispute a licensed primary elevator’s assessment of their grain. If you do not agree with the assessment of your grain at the time of delivery, you can ask that a representative sample of your grain be sent to the CGC for inspection. Payment for your grain will be subject to the inspectors grade and dockage. For more information, visit the dispute your grain grade section of the CGC website.

 

Submitted by Anne Kirk, Cereal Specialist, Manitoba Agriculture

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Considerations for Overwintering Corn

The vast majority of corn in Manitoba is in the bin, but what about those few fields that may not be harvested yet? In some cases weather conditions may have made it difficult for farmers to harvest corn in the fall, but some farmers may decide that the corn moisture level and costs associated with drying mean that it is more economical to leave corn in the field to let it dry down naturally over winter.

Just how much dry down can be expected over winter? The amount of drying that occurs in the field depends on the corn maturity, variety, and moisture content, as well as environmental factors such as temperature, humidity, solar radiation, and wind speed. Field drying is extremely slow in the winter, and corn will only dry to about 20 to 21% moisture content. In a typical year, it is expected that corn will dry approximately 11-12% in October, 4-5% in November, and just 2% per month in December and January (Table 1).      

Table 1. Estimated corn field drying

Month

EMC (%)* GDD PET (in.) Estimated Drying (% pt.)
Month Week
Sept 15 250-350 4-5 18 4.5
Oct 16 100-125 2.8-3.5 11-12 2.5
Nov 19 20-30 0.8-1.2 4-5 1
Dec 20 0 0.5-0.8 2 0.5
Jan 21 0 0.5-0.8 2 0.5
Feb 21 0 0.5-0.9 3 0.8
Mar 19 0 1.3-1.6 5 1
Apr 16 50-90 3.2-4.5 16 4
May 14 200-300 6.5-8.5 30 7

*EMC – equilibrium moisture content, GDD – growing degree days, PET – potential evapotranspiration 1EMC is the moisture content to which corn will dry and is based on air temperature and relative humidity

Source: Ken Hellevang, 2009. 2009 Post-harvest tips for later maturing corn. NDSU Extension Service.

Risks of overwintering corn Heavy snowfall during the winter can cause significant amounts of lodging resulting in yield losses. Root and stalk strength should be taken into consideration when deciding if a field should be overwintered. Research conducted at the University of Wisconsin examined corn yield loss during the winter (Table 2).

This researched showed that in 2000, a year with heavy snow cover, yield loss was much greater than in 2001, a year with very little snow cover.  Standing corn may result in more snow catch and slow soil drying in the spring, which could delay planting.

Table 2. Percent yield loss of corn left standing in the field through winter at Arlington, Wisconsin.

Harvest Month
Year Nov Dec Jan Feb Mar Apr
2000 No Loss 45% 58% 59% 65% 38%
2001 5% 5% 9% 18% 7% 10%
Mean 3% 22% 32% 37% 32% 24%

Source: Schneider and Lauer, 2009. Weight risk of leaving corn stand through winter. UW Extension -Team Grains.  http://corn.agronomy.wisc.edu/Teams/TG001.pdf

Corn can be harvested throughout the winter if conditions are cool and there isn’t much snow. If stalks stay standing throughout the winter, and ear drop and wildlife damage are limited, corn can get through the winter without much yield loss.  Yield loss throughout the winter will vary by hybrid and environmental conditions.

If you are planning to over winter corn please contact your local MASC agent.

Submitted by Anne Kirk, Cereals Specialist, Manitoba Agriculture

 

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