Recently, the carbon nitrogen cycle and non-point source pollution team of the Institute of agricultural resources and agricultural regionalization, Chinese Academy of Agricultural Sciences, based on the local life cycle theory, studied the mode of organic fertilizer replacing chemical fertilizer with different treatment methods and its impact on the yield of vegetable ecosystem, nitrous oxide and ammonia, and put forward a reasonable combination mode of planting and breeding, which can realize the resource utilization of feces Multi objective balance between increasing vegetable yield and reducing environmental load. The results provide a scientific basis for realizing the goal of reducing chemical fertilizer and the action of organic fertilizer replacing chemical fertilizer, and also provide a decision-making reference for agricultural green development. Relevant research results are published online in science of the total environment.

Vegetable production system is an important way of nitrous oxide emission and ammonia volatilization. How to slow down its nitrogenous gas emission is one of the research hotspots at present. Theoretically, organic fertilizer instead of chemical fertilizer can not only promote the resource utilization of livestock manure, but also improve soil fertility and reduce nitrogen-containing gas emissions. However, the existing research results show that the performance of organic fertilizer instead of chemical fertilizer on nitrous oxide emission and ammonia volatilization is inconsistent and uncertain. To solve this problem, the study proposed that the reason for this difference is that previous studies only focused on the impact of organic fertilizer instead of chemical fertilizer on nitrous oxide emission and ammonia volatilization, while ignoring the early links of organic fertilizer production process.

Based on the local life cycle theory, this study discussed the nitrous oxide emission and ammonia volatilization in the two stages of different organic fertilizer treatment processes and after application into farmland, as well as the impact on vegetable yield. The results showed that the organic fertilizer added with biomass carbon and pig manure solid could reduce the emission of nitrogen-containing gas by 7.6%, improve the nitrogen absorption efficiency of vegetables by 54.1%, and increase the yield of vegetables by 7.3%; Other measures did not improve or even increase nitrogen-containing gas emissions and reduce vegetable production.

The research was supported by the national key R & D plan of the 13th five year plan and the scientific and technological innovation project of the Chinese Academy of Agricultural Sciences.

(source: Institute of agricultural resources and agricultural regionalization, Chinese Academy of Agricultural Sciences)