Buckwheat – Chapter 13
Official Grain Grading Guide

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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 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.”

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”.

Representative portion of buckwheat for grading, grams

Grading factor	Minimum	Optimum	Export
Cereal grains	50	100	250
Damage	25	50	50
Dehulled	10	50	50
Ergot	500	1000	1000
Excreta	working sample	working sample	working sample
Fireburnt	500	working sample	working sample
Immature	25	50	50
Matter other than cereal grains	50	250	250
Odour	working sample	working sample	working sample
Sclerotinia sclerotiorum	500	1000	1000
Size	250	250	250
Soft earth pellets	working sample	working sample	working sample
Stones	250	500	1000

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