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Triticale – Chapter 8
Official Grain Grading Guide
Determination of dockage
Definitions
Dockage is assessed to the nearest 0.1%.
Dockage is defined under the Canada Grain Act as “any material intermixed with a parcel of grain, other than kernels of grain of a standard of quality fixed by or under this Act for a grade of that grain, that must and can be separated from the parcel of grain before that grade can be assigned to the grain.” Dockage is removed by the following cleaning procedures described in this section of the guide.
The sample as it arrives is referred to as the uncleaned or dirty sample. Its weight is the gross weight of the sample. Dockage is assessed on the gross weight of the sample.
Dockage is assessed in two stages.
- Follow Normal cleaning procedures, using the Carter dockage tester.
- Follow procedures for Cleaning for grade improvement. This cleaning can be done at any time after the cleaning assessment has been completed.
Dockage not reported
▲ Important: Dockage is not reported for samples graded
- Triticale, Sample Canada Account Fireburnt
- Triticale, Sample Salvage
- Triticale, Sample Canada Account Admixture, where all removable material is similar to the admixture
- Triticale, Sample Condemned
Normal cleaning procedures
▲ Important: Wear gloves and a mask to handle any samples that you suspect may contain hazaradous substances.
1. Set up the Carter dockage tester as follows:
| Feed control | #6 |
|---|---|
| Air control | #5 |
| Riddle | No. 25 |
| Top sieve | No. 6 buckwheat |
| Centre sieve | No. 5 buckwheat |
| Bottom sieve | Blank tray |
| Sieve cleaner control | Off |
2. Using a Boerner-type divider, divide the uncleaned sample to obtain a representative portion.
- Official samples should be at least 900 grams.
- Unofficial samples should be at least 750 grams.
3. Turn on the Carter dockage tester.
4. Pour the sample into the hopper.
5. After the sample has passed through the machine, turn on the sieve cleaner control for two or three seconds to remove kernels lodged in the sieve.
6. Turn off the Carter dockage tester.
7. Lightly snap the retainer rod of the aspiration pan to loosen material gathered on the air screen.
8. Examine the material passing through the No. 5 buckwheat sieve.
If any significant amount of small whole triticale passed through the No. 5 buckwheat sieve, you must resieve this portion over the No. 5 buckwheat hand sieve. Return any triticale remaining on the sieve to the cleaned sample.
9. Handpick sound large kernels of triticale from the portion passing over the riddle and return them to the cleaned sample. Do not pick kernels with long rootlets. See Composition of dockage and Sprouted.
10. Determine dockage, using the list under Composition of dockage.
Composition of dockage
Dockage includes
- Triticale with long rootlets removed by the riddle.
- For samples of triticale which are graded Triticale Sample CAN Account
Sprouted any triticale with long rootlets that was removed by the riddle will be returned to the sample and not assessed as dockage. (See Sprouted) - A maximum of 10% of soft earth pellets handpicked from the clean sample
- Material other than triticale removed by the No. 25 riddle
- Material removed by aspiration
- Material that has passed through the No. 5 buckwheat Carter sieve
- Material removed by Cleaning for grade improvement
Cleaning for grade improvement
If the grade of a delivery can be improved by additional cleaning, perform the cleaning and add the additional material to dockage. Cleaning for grade improvement can be done at any time after the cleaning assessment has been completed.
- After the cleaning assessment has been complteed, sieve the sample by hand using the appropriate sieve. See the table Cleaning for grade improvement—Triticale for the list of sieves.
▲ Important: When you use a hand sieve, move the sieve from left to right 30 times, using a sifting motion. One time is one complete motion from the centre, to one side, to the other side, and back to the centre. The total distance from left to right is 20 cm, or about eight inches. - Weigh the additional dockage and add it to the original dockage
| Material to be removed | Equipment | Effect on composition of dockage |
|---|---|---|
| Broken kernels | No. 6 buckwheat hand sieve | If the weight of broken kernels is over the grade tolerance but is
|
| Stones | No. 6 buckwheat hand sieve | If the weight of wheat removed as a percentage of the gross weight of the sample is
|
| Foreign material | No. 6 buckwheat hand sieve or the No. 9x9 wire hand sieve. | Foreign material includes cockle, wild oats and pin oats. |
Optional analysis
Where a shipper requests special cleaning of a carlot of grain at a terminal or transfer elevator, and the elevator manager agrees, dockage material will be analyzed for the presence of grain. The percentage and grade of any grain contained in the dockage will be reported and elevator stocks will be adjusted on the basis of the analysis. Agreement of the shipper and unload elevator must be conveyed to the Canadian Grain Commission in writing prior to the analysis being performed.
Procedures
- Analyze the official sample.
- Record the following on inspection records:
- The percentage by gross weight to the nearest 0.1% and the grade of triticale.
- The percentage by gross weight to the nearest 0.1% and the grade of grain separable from dockage.
- The percentage of dockage.
- Example
- 95.0% Triticale, No. 1 CAN
- 4.0% Domestic Mustard Seed, No. 1 CAN Oriental
- 1.0% dockage
