Chickpeas – Chapter 22 | Official Grain Grading Guide

Determination of dockage

Definitions

Dockage is assessed and recorded 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 following the 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 not reported

Important:

Dockage is not reported for samples grading:

  • Chickpeas, Sample CW (class) Account Fireburnt
  • Chickpeas, Sample Salvage
  • Chickpeas, Sample Condemned

Normal cleaning procedures

Important:

Wear gloves and a mask to handle any samples that you suspect may contain hazardous substances.

Dockage is assessed only on unprocessed samples of chickpeas. All foreign material in processed samples is assessed as grading factors.

  1. Using a Boerner-type divider, divide the uncleaned sample to obtain a representative portion.
    • Official samples shall be at least 1 kg.
    • Unofficial samples shall be at least 1 kg.
  2. Choose the hand sieve for the class of chickpeas that will achieve maximum removal of dockage material with minimum loss of chickpeas:
    • Kabuli: No. 18 round-hole sieve (large seeded), No. 12 slotted sieve (medium seeded)
    • Desi: No. 12 slotted sieve
  3. Sieve the sample, using approximately 250 grams at a time, over the appropriate sieve to remove all readily removable material.
  4. Handpick the portion remaining on top of the sieve to remove all course foreign vegetable matter such as pods, stems, straw, thistle tops.

Composition of dockage

All material removed by seiving or handpicking or both, as defined in Normal cleaning procedures.

Optional analysis

Where a shipper requests special cleaning of a carlot of grain at a terminal 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.

Procedures

  1. Analyze the official sample.
  2. Record the following on inspection records:
    • The percentage by gross weight to the nearest 0.1% and the grade of chickpeas.
    • 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% ChickPeas, No. 1 CW Desi

4.0% Domestic Mustard Seed, No. 1 CAN Oriental

1.0% dockage

Sizing

Upon written request, samples of chickpeas may be analyzed for size. Sizing procedures are as follows:

Procedures

  1. Using a Boerner-type divider, divide the clean sample to obtain a representative portion of between 250 - 300 grams.
  2. Pour the representative sample onto the left hand side of the hand sieve.
  3. Move the sieve from left to right 20 times, using a sifting motion. One time is one complete motion from center, to one side, to the other side and back to the center. The total distance from left to right is 20 cm or about 8 inches.
  4. Determine the amount remaining on top of the sieve. Passing your hand along the underside of the sieve may be necessary in order to dislodge all the seeds.
  5. Report the percent by weight of the seeds remaining on top of the sieve.
Note:

The size of sieve must be clearly indicated on the written request. Generally, sizing would be done using one of the following hand sieves - No. 8, 9 or 10 mm round hole, however, the analysis can be done on any sieve size as requested.