Composting is an aerobic process, which is a fancy way of saying it needs air. What’s more, air is probably even more important than food the average compost pile runs out of air long before it runs out of food.
If there isn’t enough air, decomposition becomes anaerobic, which is bad news for two reasons. First, it’s much slower than aerobic composting, and second, some of the products, such as ammonia and hydrogen sulfide, don’t smell very nice.
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