All of these methods of processing poultry manure will be discussed in greater detail later in this review. It is important to note that all of these systems have merit. A certain system may work for a particular operation but not for another operation because of certain circumstances, such as location, climate, size, land availability, crops, and markets. All of these factors greatly influence the way poultry manure is collected, handled and processed. Each system of collection, handling and processing has its own merits and uses. They all attempt to solve the problem of poultry manure management in their own specific.