Determination of dockage

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