Sunflower seeds - Chapter 14 | 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, 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 sample 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 portion sizes 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 sunflower seed for grading, grams
Grading factor Sample portion size range
Minimum Maximum
Damage 25 100
Dehulled 25 100
Ergot 500 working sample
Excreta working sample working sample
Fertilizer pellets working sample working sample
Fireburnt working sample working sample
Heated, rotted, mouldy 50 100
Head rot (hulls) 25 100
Head rot (seeds) 5 25
Insect damage 50 100
Odour working sample working sample
Other grains 100 250
Sclerotinia sclerotiorum 250 working sample
Soft earth pellets working sample working sample
Stones working sample working sample
Treated seed working sample working sample
Very immature seeds 25 100