XDA28070302 - Sub-project on Maize–Soybean Rotation Soil Ecological Function Enhancement – Postgraduate Training

It systematically collects three master's degree theses and two supplementary supporting documents completed under the support of this program, covering five major research directions: the effects of organic fertilizer substituting chemical fertilizer on soil aggregates and organic carbon fractions in Mollisols; the effects of organic fertilizer substituting chemical fertilizer on soil quality and soybean yield in Mollisols; the effects of organic fertilizer substituting chemical fertilizer on soil quality and soybean yield in Mollisols; the enhanced reduction patterns of acetochlor in Mollisols by biochar-immobilized *Sphingomonas* DNH27; and the coupling regulation of crop habitat health in cold regions through maize–soybean rotation combined with bio-organic fertilizer.