“Significant progress has been made in the study of heavy metal pollution risks in livestock and poultry manure in China. The research team has established a multi-source database of heavy metal element content in livestock and poultry manure, and systematically analyzed the differences in heavy metal content and the risk of exceeding standards in different types of livestock and poultry manure. It was found that the enrichment level of heavy metals in solid manure was significantly higher than that in liquid manure, and pigs and poultry were the main contributors to heavy metal input in manure. This provides a solution to the problem of pollution prevention and control in the return of livestock and poultry manure to the field.”