Wheat – Chapter 4
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 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, 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 wheat for grading, grams

Grading factor	Minimum	Optimum	Export
Artificial stain	250	500	500
Binburnt kernels	100	1000	1000
Blackpoint	25	50	50
Common bunt	50	100	100
Darkened kernels	100	500	500
Dark immature kernels	50	100	100
Degermed kernels	25	50	50
Ergot	working sample	working sample	working sample
Excreta	working sample	working sample	working sample
Fireburnt	500	working sample	working sample
Fusarium damage	10	100	100
Grasshopper, armyworm damage	50	100	100
Grass green kernels	50	100	100
Hard vitreous kernels, sieving	250	250	250
Hard vitreous kernels, handpick	15	25	25
Heated	25	250	500
Matter other than cereal grains	50	100	250
Mouldy	100	1000	1000
Natural stain	50	100	100
Odour	working sample	working sample	working sample
Other cereal grains	25	100	250
Other cereal grains and other matter	250	250	250
Penetrated smudge	100	500	500
Pink kernels	50	100	100
Red smudge	100	500	500
Rotted	100	1000	1000
Sawfly, midge damage	50	100	100
Sclerotinia	500	1000	1000
Severe midge damage	25	100	100
Severely mildewed	100	1000	1000
Severely sprouted	50	100	100
Shrunken and broken	250	250	250
Smudge	100	500	500
Soft earth pellets	working sample	working sample	working sample
Sprouted kernels	10	100	100
Stones	500	1000	1000
Superficial discolouration	working sample	working sample	working sample
Total Damage	25	100	100
Wheats of other classes or varieties	15 to 50	25 to 100	25 to 100

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