Mix one or more brassicas (rape, kale, or turnips) and a cereal grain (wheat, rye, or oats) together in a large bucket, using a 1-to-2 or 1-to-3 ratio. Spread the mixture lightly and evenly. Never bury it deeper than 1/8 inch. Drive over the area with an ATV to create a firm seed-to-soil contact. Or drag a section of chain-link fence over it.