Seed cleaning
Once threshed, radish seeds may be separated
from the pods, chaff, and debris by screening and
winnowing the seed. Seed cleaning screens are
numbered by number of 64ths of an inch size
holes. Seed of most varieties may be separated by
using a 9 or 10 size screen which allows the seed
to pass through the screen while removing larger
chaff. A 5 or 6 size screen may also be useful to
retain the seed and allow smaller debris to be
removed. If the chaff is adequately dried, much of
it should be lighter than the seed and may also be
removed by winnowing (separating by weight), by
either dropping the material in front of a fan by
hand or using a gravity table.