An LAI-driven spectral critical curve based on the interference-mitigation chlorophyll index for nitrogen diagnosis in winter oilseed rape (Brassica napus L.) under contrasting mulching systems - Zijun Tang; Liang Cheng; Yannian Li; Zhiying Liu; Tao Sun; Fanghao Tao; Ming Jin; Xueyan Zhang; Fucang Zhang; Youzhen Xiang (Field Crops Research, 2026)