Machine learning prediction of soil carbon fractions using bulk-soil and fraction-specific MIR spectra: Is physical fractionation necessary? - Yijia Tang; Thi Kim Anh Tran; Budiman Minasny; Wartini Ng; Nicolas Francos; Yin-Chung Huang; Ho Jun Jang; Peipei Xue; Mingming Du; Shiva Bakhshandeh; Alex McBratney (Soil and Tillage Research, 2026)