NIR Spectral Inversion Model for Soil C and N

Spectral preprocessing with joint wavelength selection

Integrates VIP-SPA wavelength selection and SG first derivative preprocessing to improve NIR estimation accuracy for SOC, STN, and C/N in farmland soils.

Qiao, Xingxing · Peifan, Lou · Yanxia, Chen · Mingyu, Zong · Yang, Sha · Yaxin, Wang · Yu, Zhao · Meichen, Feng · Xiao, Lujie · Song, Xiaoyan · Zhang, Meijun · Zhang, Xiaoxian · Yang, Wude · Wang, Chao

Land Degradation and Development 2026

Advantages

R²v = 0.7258, RMSEv = 2.5343, RPDv = 1.8770

R²v = 0.6428, RMSEv = 0.5161, RPDv = 1.6710

R²v = 0.7479, RMSEv = 3.2608, RPDv = 1.9956