Abstract:

It is an important way to realize green development of agriculture in Sichuan hilly areas by selecting a reasonable ecological circular agriculture model according to local climate resources and agricultural types and carrying out nutrient balance management. This paper took Pengxi County of Sichuan as an example to conduct the empirical analysis, aiming to provide a scientific basis for the development of ecological circular agriculture in the hilly areas of eastern Sichuan. The results show that, based on the target yields and target nitrogen (N) application rates of crops and orchards, the application amount of organic fertilizer (biogas slurry) is calculated. The livestock and poultry manure and biogas slurry, which are produced in the project area, could be recycled within the crop fields and orchards, and the replacement rate of chemical fertilizer N could reach 31%-62%. Based on the calculation of the manure and organic fertilizer replacement in crop fields and orchards, the carrying capacity of livestock in the project area still has a certain potential. The model combines the local leading and advantageous agricultural industries, uses local planting and breeding wastes scientifically and rationally, and reduces the risk of agricultural non-point source pollution. Finally, the analysis of the management mechanism and development path of ecological circular agriculture in this study could provide an example for the development of circular agriculture in the hilly areas of eastern Sichuan.

Key words: livestock and poultry manure, resource utilization, nitrogen and phosphorus pollution, integrated crop-livestock production, circular agriculture