Mitigation of greenhouse gas emissions through optimized irrigation and nitrogen fertilization in intensively managed wheat-maize production.

ABSTRACT: In the wheat-maize rotation cultivation system in northern China, excessive irrigation and over-fertilization have depleted groundwater and increased nitrogen (N) losses. These problems can be addressed by optimized N fertilization and water-saving irrigation. We evaluated the effects of these practices on greenhouse gas emissions (GHG), net profit, and soil carbon (C) sequestration. We conducted a field experiment with flood irrigation (FN0, 0 kg N ha^-1 yr^-1, FN600, 600 kg N ha^-1 yr^-1) and drip fertigation treatments (DN0, 0 kg N ha^-1 yr^-1; DN420, 420 kg N ha^-1 yr^-1; DN600, 600 kg N ha^-1 yr^-1) in 2015-2017. Compared with FN600, DN600 decreased direct GHGs (N₂O + CH

SUBMITTER: Zhang X 

PROVIDER: S-EPMC7125187 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature