Title: Development Strategies for Utilization Models for Returning Livestock and Poultry Manure to the Land
Abstract: This paper summarizes the development of various utilization models for returning livestock and poultry manure to farmlands.It analyzes the problems affecting the industrial development of livestock and poultry manure recycling in China, discusses developmental strategies for the next step in this process.In past years, important progress has been made in exploring utilization models for returning livestock and poultry manure to farmlands, and in identifying suitable parameters for the livestock-carrying capacity of such lands, both at home and abroad.However, problems remain, such as nutrient imbalance after combining planting and livestock systems, large nutrient losses, and a lack of reasonable principles for manure application on farmlands.In future, studies should focus on the environmentally friendly return of manure to farmlands and introduce the concept of nutrient management after combining planting and livestock systems.Techniques should be introduced for the collection, storage, and processing of manure; for the return of the manure to farmlands; for reasonable manure application; and for balancing the nitrogen and phosphorus nutrients in order to reduce non-point-source pollution; among other aspects.In addition, policies for the efficient recycling of livestock and poultry manure should be promoted.