Oats: Grading

Important definitions

Net weight of sample
The sample after cleaning and removal of dockage is referred to as the cleaned sample. Its weight is the net weight of the sample. Percentages by weight for grading refer to percentages of the net weight.
Hazardous substances in samples
Wear gloves and a mask to handle any samples that you suspect may contain hazardous substances. Hazardous substances are defined in the Regulations as “any pesticide, herbicide, desiccant or inoculant.”
Non-registered varieties
Where grain of any kind is not a registered variety under the Seeds Act, no person shall, except with the permission of the Canadian Grain Commission, assign a statutory grade to that grain which is higher than the lowest grade established by regulation for that kind of grain.

Representative portion for grading

All grading is done on representative portions divided down from the clean sample, using a Boerner-type divider.

The terms “Minimum” and “Maximum” refer to the range of sample portion size to be analyzed when an objective factor is present. The optimum representative portion (see glossary) is determined by taking into consideration the tolerance and concentration of the objective factor being assessed.

Representative portion of oats for grading, grams
Grading factor Sample portion size range
Minimum Maximum
Barley 25 100
Cereal grains other than barley and wheat 25 100
Covered smut and false loose smut working sample working sample
Damage 10 50
Ergot 500 working sample
Excreta working sample working sample
Fertilizer pellets working sample working sample
Fireburnt 500 working sample
Frost damage 5 25
Fusarium damage 25 100
Green 10 50
Heated 25 100
Hulled 25 100
Large seeds 50 250
Mildew 25 50
Odour working sample working sample
Rotted 25 working sample
Sclerotinia sclerotiorum 500 working sample
Soft earth pellets working sample working sample
Stones working sample working sample
Thins 250 250
Treated seed working sample working sample
Wheat 25 100
Wild oats 25 100
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