Experimental grades of wheat: Grading factors
Samples eligible for experimental grades but displaying grading factors other than stones that are above established tolerances are graded Canada Western Feed or Sample depending on the severity of the grading factors.
Full list of grading factors
Important: Wear gloves and a mask to handle any sample that is suspected of containing contaminated grain.
Contaminated is defined in the Canada Grain Act as; “Contaminated means, in respect of grain, containing any substance in sufficient quantity that the grain is unfit for consumption by persons or animals or is adulterated within the meaning of the regulations made pursuant to sections B.01.046(1), B.15.001 and B.15.002(1) of the Food and Drugs Act.”
Samples deemed to be contaminated by the Grain Research Laboratory in consultation with the Chief Grain Inspector for Canada are graded Wheat, Sample Condemned.
Tolerances apply to kernels not classed as sprouted.
Fertilizer pellets (FERT PLTS)
Fertilizer pellets are a manufactured plant nutrient product used by producers in the production of grain. They are typically small, round or irregular shaped and usually white, grey, brown, pink or reddish in colour.
Note: Canadian Grain Commission personnel should refer to ISO national work instruction “Suspect Contaminated Grain, Handling Procedures” for procedures to be followed when handling samples containing fertilizer pellets.
- Handpick any fertilizer pellets and determine the concentration basis the net working sample.
- Fertilizer pellets are assessed as stones when the concentration does not exceed 1.0% of the net sample weight.
- Samples containing fertilizer pellets in excess of 1.0% of the net sample weight are graded "Wheat, Held IP Suspect Contaminated Grain".
Grass green (GRASS GR)
Tolerances are only a guide. Consider the overall quality of the sample.
Hard vitreous kernels (HVK)
Vitreousness is the natural translucent colouring that is a visible sign of kernel hardness. It is a factor for hard wheat varieties only. For a full description, see Chapter 4.
Insect damage (I DMG)
Consider the overall quality of the sample.
Stones are hard shale, coal, hard earth pellets, and any other non toxic materials of similar consistency. Fertilizer pellets are assessed as stones when constituting 1.0% or less of the net sample weight. (See Fertilizer pellets for specific procedures to be followed when samples contain fertilizer pellets.)
- Handpick stones from a representative portion of the cleaned sample.
- Determine stone concentration in the net sample.
Note: Stones may be removed and included in dockage if the material removed is 5.0% or less of the gross weight of the sample. See Cleaning for grade improvement.
- In western Canada samples of grain containing stones in excess of “basic grade” tolerances, up to 2.5% are graded Wheat, Rejected “basic grade” Account Stones. The “basic grade” refers to a grade established in the Canada Grain Regulations (grades listed in the first column in grade determinant tables) that would have been assigned to the sample if it contained no stones.
- In western and eastern Canada grain containing more than 2.5% stones is graded Wheat, Sample Salvage.
Examples: Western Canada
Excerpt from grade determinant tables
|Grade name||Stones %|
|number 1 CW EXPRMTL||0.03|
|number 2 CW EXPRMTL||0.03|
|number 3 CW EXPRMTL||0.06|
- Basic grade: Wheat, number 3 Experimental
- Reason for basic grade: Mildew
|If the above sample contained||Grade in Western Canada|
|0.08% stones||Wheat, Rejected number 3 CW Experimental Account Stones|
|3.00% stones||Wheat, Sample Salvage|
Treated seed and other chemical substances
Test weight (TWT)
Test weight is the weight of a measured volume of grain expressed in kilograms per hectolitre. For procedures, see Chapter 1 of this guide, Determining test weight.
Treated seed is grain that has been coated with an agricultural chemical for agronomic purposes. These seed dressings contain a dye to render the treated seed visually conspicuous. The colour of the dye varies depending upon the type of treatment and the type of grain. The current Canadian colour standards for pesticide seed treatments for cereals is pink or red and for canola is baby blue, white and green. Seed treated with an inoculant may have a green stain. The coatings or stains may appear greasy or powdery and surface area distribution ranges from tiny flecks to complete coverage.
Other chemical substances
Other chemical substances refers to any chemical residues either adhering to the kernel or remaining in the sample and to samples having a chemical odour of any kind.
Important: Wear gloves and a mask to handle any samples that you suspect may contain contaminated grain.
If a sample is suspected of being coated with a pesticide, desiccant, inoculant or if the sample contains evidence of any foreign chemical substance other than fertilizer pellets, the sample shall be graded Wheat, Held IP Suspect Contaminated Grain.
Note: Canadian Grain Commission personnel should refer to ISO national work instruction “Suspect Contaminated Grain, Handling Procedures” for specific procedures to be followed when handling samples suspected of containing treated seed or other chemical substances.
- Experimental grades of wheat: Classes and varieties, cleaning, and grading
- Experimental grades of wheat: Primary grade determinants tables
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