Buckwheat - Chapter 13 | Official Grain Grading Guide

Export shipments

Export shipments can be commercially clean or not commercially clean.

Commercially clean

Shipments defined as commercially clean when the net dockage does not exceed 2.5% of the sample weight.

Any whole domestic buckwheat removed in dockage assessment is returned to the clean sample. Dockage in shipments is reduced by up to

  • 0.3% for fine attritional material which passes through the No. 4.5 round-hole sieve
  • 0.5% for broken or hulled buckwheat removed by aspiration or passing through the No. 5 buckwheat or the No. 6 slotted sieve

Not commercially clean (NCC)

Shipments that do not meet the standards for commercial cleanliness are referred to as not commercially clean. Such shipments are permitted only with the permission of the Canadian Grain Commission.

For samples representing not commercially clean shipments approved by the Canadian Grain Commission for shipment from terminal elevators, dockage is reported to the nearest

  • 0.1% for samples representing shipments loaded from a single terminal elevator
  • 0.01% for composite samples representing shipments loaded from more than one terminal elevator

Instead of the allowance for broken seed in commercially clean shipments, a direct deduction of 0.2% is applied to establish net dockage for direct shipments only.

Assessing dockage for small buckwheat

Follow the primary dockage assessment procedures, with the Carter dockage tester set as follows.
Feed control #6
Air control #3
Riddle None
Top sieve No. 5 buckwheat
Centre sieve No. 4.5 round-hole
Bottom sieve Blank tray
Sieve cleaner control Off

Dockage consists of the following:

  • Material other than whole domestic buckwheat which passes through the No. 5 buckwheat or the No. 6 slotted sieve, less fine attritional material, broken or hulled buckwheat constituting not more than 0.5% of the sample by weight
  • Material in excess of grade tolerances which is handpicked from the cleaned sample, other than cereal grains

Assessing dockage for large buckwheat

Follow the primary dockage assessment procedures, with the Carter dockage tester set as follows.
Feed control #6
Air control #3
Riddle None
Top sieve No. 6 slotted
Centre sieve No. 4.5 round-hole
Bottom sieve Blank tray
Sieve cleaner control Off

Dockage consists of the following

  • Material other than whole domestic buckwheat that passes through the No. 6 slotted sieve, less fine attritional material, broken or hulled buckwheat constituting not more than 0.5% of the sample by weight
  • Material in excess of grade tolerances which is removed by aspiration, other than whole domestic buckwheat
  • Material in excess of grade tolerances which is handpicked from the cleaned sample, other than cereal grains

Grading

Buckwheat on export is graded in accordance with export grade specifications.