Bio-Straw Resource Recycling Systems: Agricultural Productivity and Green Development

Abstract

Straw recycling is closely associated with agricultural productivity and green development. We integrated straw recycling systems from 1979 to 2019 into three cereal crops to identify crop productivity and GHG emissions in LCA, and to explore GHG mitigation potential using scenario analyses. Straw recycling increased wheat, maize, and rice yields by 7.8%, 5.2%, and 5.0%. Straw recycling reduced net GHG emissions by 33.1% in wheat and 12.1% in maize due to high soil carbon sequestration. In rice, straw recycling depressed N2O emissions but increased net GHG emissions by 59.8% because CH4 emissions were 2.06 times greater than those under fertilizer management. When combined with optimal fertilizer inputs, 100% straw recycling further reduced net GHG emissions in upland, whereas 60% straw recycling produced better results in paddy. Enhancing the quantity and quality of straw recycling, based on crop-specific, contribute to the dual targets of achieving higher crop yields and green development.

Keywords: Bio-straw recycling, Fertilizer input, green development, greenhouse gas emission, Life Cycle Assessment