1. Determination by
hand sieves shall be by 6x22, 6x21, 6x20, 6x18 mesh per inch [2.54 centimeters]
wire sieves and 5/64, 5.5/64, 6/64, 6.5/64, 7/64, 7.5/64 inch round hole
sieves.
2. Determination by
machine shall be by the Carter dockage tester for aspiration.
a. Dockage determination shall be made on the
basis of a representative portion of five hundred grams of rapeseed cut from
the sample as a whole as follows:
(1) The
sample is scalped on the appropriate round hole sieve which will achieve
maximum removal of large foreign material with minimum loss of rapeseed.
(2) The scalped sample is run over
the Carter dockage tester for aspiration using feed 3 and air 5 settings, using
the 000 plastic riddle.
(3) The
sample is then screened on the wire mesh sieve which achieves maximum cleanout
of weed seeds and other foreign material with a minimum loss of reasonably
sound rapeseed.
(4) A
representative subsample of not less than twenty grams properly divided from
the cleaned sample is handpicked for the remaining inseparable foreign matter
(matter other than rapeseed) which is easily distinguished by visual
inspection.
b.
Computation of total dockage shall be as follows:
(1) The percent of dockage removed by the
hand sieves and the Carter dockage tester shall be computed on the basis of the
sample as a whole. The percentage of dockage removed by handpicking shall first
be computed on the basis of the handpicked portion and then on the basis of the
percentage of the mechanically cleaned and hand-sieved rapeseed.
For example, if in a given sample, the dockage removed by
mechanical means and hand sieves is ten percent, the percentage of mechanically
cleaned and hand-sieved seed (or rapeseed) is ninety percent. If the percentage
of dockage removed by handpicking is two percent of the handpicked portion, the
two percent shall be multiplied by nine-tenths to obtain the percent of
handpicked dockage, one and eight-tenths. The percent of mechanically and
hand-sieved dockage, ten percent is then added to the handpicked dockage, one
and eight-tenths percent to give a total dockage of eleven and eight-tenths
percent.
(2) Dockage is
assessed to the nearest one-tenth of one percent. The results of individual
cleaning procedures will be recorded on the reverse side of the sample tickets.
Example: 3.4% 5/64 round holes, 4% 6x21 wire, 1.7% air
Notes
N.D. Admin Code
74-06-01-02
Effective September 1,
1979.
General Authority: NDCC 4.1-53-11(6)
Law Implemented: NDCC
4.1-53-11(6)
