Domestic mustard seed: 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. For grading, percentages by weight refer to percentages of the net weight.
Kernel counts (K)
A kernel count is the number of kernel-sized pieces in a 500 g sample.
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 section 1 of the Canada Grain Regulations as “any pesticide, desiccant or inoculant.”
Rounding rules
Rounding rules are outlined in schedule 3 of the Canada Grain Regulations. When official inspection results are expressed numerically, they should be expressed to the same decimal precision as the applicable tolerance in the primary and export grade determinants table.
Crush
A crush is one pass of the roller under firm pressure over a seed stick on masking tape.
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 optimum representative portion is the representative sample size within the minimum and maximum range used to obtain the most accurate result when assessing an objective factor. It is determined by taking into consideration the tolerance and concentration of the objective factor being assessed.

Representative portion of domestic mustard seed for grading, grams
Grading factor Sample portion size range
Minimum Maximum
Blotched (Oriental mustard seed) 5 25
Canola 5 25
Cockle 5 50
Colour working sample working sample
Conspicuous admixtures 5 50
Damage 5 25
Distinctly detrimental 5 50
Distinctly green 500 seeds 1000 seeds
Ergot 500 working sample
Excreta working sample working sample
Fertilizer pellets working sample working sample
Fireburnt working sample working sample
Heated 500 seeds 1000 seeds
Inconspicuous admixture (Brown & Oriental mustard seed) 5 25
Odour working sample working sample
Other classes 5 25
Other distinctly deterimental seeds (Yellow mustard seed) 5 25
Rime 5 25
Sclerotinia sclerotiorum 100 500
Soft earth pellets working sample working sample
Stones working sample working sample
Treated seed working sample working sample
Wild mustard seed 5 25
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