Original ResearchPublished 12 October 2026Comprehensive effects of plastic film mulching and combined application of water and nitrogen on photosynthetic characteristics, yield formation, and water-nitrogen use efficiency of citrusHongmei Gu · Ping Li · Mengyuan Deng · Yun Zhong · Yuliang Fu · Songlin WangFrontiers in Plant Sciencedoi 10.3389/fpls.2026.1963480