Wheat - Chapter 4 | Official Grain Grading Guide

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 cleaned sample, or the net weight.

Hazardous substances in sample

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 wheat for grading, grams
Grading factor Sample portion size range
Minimum Maximum
Artificial stain 250 working sample
Binburnt kernels 250 working sample
Blackpoint 25 50
Common bunt 50 100
Contrasting Classes 50 100
Darkened kernels 50 100
Dark immature kernels 50 100
Degermed kernels 25 50
Ergot 500 working sample
Excreta working sample working sample
Fertilizer Pellets working sample working sample
Fireburnt working sample working sample
Foreign Material 50 250
Fusarium damage 10 100
Grasshopper, armyworm damage 50 100
Grass green kernels 50 250
Hard vitreous kernels, sieving 250 250
Hard vitreous kernels, handpick 10 25
Heated 25 250
Matter other than cereal grains 50 250
Mouldy 100 working sample
Natural stain 50 100
Odour working sample working sample
Other cereal grains 50 250
Other cereal grains and other matter 50 250
Penetrated smudge 50 250
Pink kernels 50 250
Rotted 100 working sample
Sawfly, midge damage 10 50
Sclerotinia 500 working sample
Severe midge damage 50 100
Severely mildewed 100 working sample
Severely sprouted 50 100
Shrunken and broken 250 250
Smudge 50 100
Soft earth pellets working sample working sample
Sprouted kernels 10 100
Stones working sample working sample
Total Damage 25 100
Treated seed working sample working sample
Wheats of other classes or varieties 15 50