Mixed grain - Chapter 9 | 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. For grading, percentages by weight 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 Regulationsas “any pesticide, herbicide, dessicant or inoculant.”

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 mixed grain for grading, grams
Grading factor Sample portion size range
Minimum Maximum
Broken 25 50
Ergot 500 working sample
Excreta working sample working sample
Fertilizer pellets working sample working sample
Fireburnt working sample working sample
Fusarium damage 25 100
Heated 25 100
Large seeds 100 250
Odour working sample working sample
Sclerotinia sclerotiorum 500 working sample
Soft earth pellets working sample working sample
Stones working sample working sample
Treated seed working sample working sample