Canadian Grain Commission
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Canola and rapeseed – Chapter 10
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 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, dessicant or inoculant.”
Crush
A crush is one pass of the roller under firm pressure over a 100-seed stick on masking tape.
Representative portion for grading
All grading is done on representative portions divided down from the cleaned sample, using a Boerner-type divider.
Values in the following table represent a range of recommended portions of samples for grading. Refer to definition of “Representative portion” in the glossary for a complete description of the terms “Minimum”, “Optimum” and “Export”.
| Grading factor | Minimum | Optimum | Export |
|---|---|---|---|
| Conspicuous admixture | 10 | 25 | 25 |
| Damage | 5 | 10 | 10 |
| Distinctly green | 5 crushes | 10 crushes | 10 crushes |
| Ergot | 100 | 500 | 500 |
| Excreta | working sample | working sample | working sample |
| Fireburnt | 500 | working sample | working sample |
| Heated | 5 crushes | 10 crushes | 10 crushes |
| Inconspicuous admixture | 1 | 5 | 5 |
| Insect excreta | 100 | 500 | 500 |
| Odour | working sample | working sample | working sample |
| Rime | 5 | 25 | 25 |
| Sclerotinia sclerotiorum | 100 | 500 | 500 |
| Soft earth pellets | working sample | working sample | working sample |
| Staghead | 10 | 25 | 25 |
| Stones | 100 | working sample | working sample |
