The finer the particles, the faster they will be consumed. The faster a compost is made, the better it is because there is less time for the dissipation of valuable gases and the leaching out of essential elements. Kitchen scraps - Fruit and vegetable trimmings and leftovers are good items for the compost pile. However, don't use animal products, such as grease, fat and meat trimmings, since they break down very slowly, attract rodents and other pests, and have an unpleasant odor. Don't use large twigs because they break down slowly.
Bone meal is a good addition to the compost pile because it is high in nitrogen.
Most people have problems with compost piles when they make them with a single ingredient. If only one ingredient is used, sometimes no decomposition will occur, regardless of additives and techniques used. It is essential to add some nitrogen-rich material, such as fresh or dried manure or commercial fertilizer, because the nitrogen in these materials is needed nutrition for the decomposing bacteria. If a compost pile is properly made and maintained, an excellent composted material should be ready for use in 90 to 120 days. The compost pile can be free-standing or in an enclosure of some type.