QUESTION: Can lime be composted?
ANSWER: Lime is controversial as a compost ingredient. The USDA advises using lime to balance the pH level of compost, while some gardeners use it to reduce odors a compost pile might create. However, other experts note that the finished product of compost normally has a neutral pH balance, so for most people, lime should only be used just before applying compost and as needed to correct pH levels.
To add lime to completed compost, use a wheelbarrow with a wire screen of half an inch to one inch mesh laid over the top to sift compost into the wheelbarrow until the wheelbarrow is half full. Then add half a cup of powdered lime by sprinkling it across the surface of your compost, then stirring to combine the two fully. The compost with added lime is now ready to use.