Soybeans – Chapter 20 | Official Grain Grading Guide


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 net weight.

Hazardous substances in samples

Wear gloves to handle any samples that you suspect may contain hazardous substances. Hazardous substances are defined in the Regulations as “any pesticide, herbicide, dessicant 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 portions 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 soybeans for grading, grams
Grading factor Sample portion size range
Minimum Maximum
Colour working sample working sample
Damage 50 250
Downy mildew 100 250
Ergot 500 working sample
Excreta working sample working sample
Fertilizer pellets working sample working sample
Fireburnt working sample working sample
Foreign material 100 500
Heated, mouldy, rancid 50 500
Immature 50 250
Odour working sample working sample
Other colours or bicoloured other than for mixed soybeans 100 working sample
Sclerotinia sclerotiorum 500 working sample
Soft earth pellets working sample working sample
Splits, seed coats 250 working sample
Stained, mottled working sample working sample
Stones working sample working sample
Treated seed working sample working sample