Show cleaning grain gives farmers half million farmers in the spring wheat states gained half a million dollars during the post past season by cleaning wheat of dockage as part of the threshing operation era tion according to robert I 1 H black who Is engaged in grain cleaning research for the bureau of agricultural economics united states department of agriculture sir air black says that more than 1000 threshing machines in the spring wheat area during the 1930 threshing season were equipped with special grain cleaners for the removal of dockage the average quantity of wheat and rye cleaned by each of these inn chines was in excess of bushels so that somewhat more than bushels were cleaned in the aggregate regate the type of cleaner used removed most of the dockage and generally tn in creased the test weight of the grain in many instances cleaning improved the grain by one or more grades the net gain in the market value of the grain cleaned mr air black says was more than a quarter million dollars ond and the value of the dockage or screenings removed was more than |