You don't have to worry about digging the fresh material into the pile or even covering it over due to the fact that when it is frozen it won't be a pest attractant. When spring arrives, the materials will thaw out and begin to compost. When the compost has thawed, turn it over and within a couple of days, the material should lose about half of its volume. If you follow the above guidelines, your composting operation should run fairly smoothly. Ammonia Sulphur odour occurs when the pile is too wet.
Ammonia odour occurs when there is an excess of nitrogen or green material.
For sulphur smells, simply mix in dry ingredients, such as soil or dried leaves or grass clippings. To remedy ammonia odour, add materials containing more carbon, such as leaves or dry grass clippings. Extra soil added during the turning will help with the immediate odour problems. Mix in materials that do not compact, such as green twigs and plant stems. These will help to create more air voids.