We aimed to optimize field border length in the Huang-Huai-Hai Plain of China (HPC) reduce soil inorganic nitrogen residues and increase absorption utilization by wheat plants using a traditional irrigation system. In two-year experiment (2017–2019) conducted HPC, four lengths were tested: 20 m (L20), 30 (L30), 40 (L40), 50 (L50). Supplementary was implemented during jointing anthesis stages, c...