Original ResearchPublished 4 September 2026Optimizing the ratio of conventional urea to polyurethane-coated urea via single basal application improves growth, nitrogen use efficiency and economic return of tillering mustardXinyu Zeng · Lincheng Wu · Baozheng Li · Bo Xiao · Hongxia Zong · Luyao Feng · Hailin Liu · Fei LeiFrontiers in Soil Sciencedoi 10.3389/fsoil.2026.1916307