Straw-Derived Synthetic Humic Acid Improves Soil Structure, Nutrient Availability, Humification, and Crop Productivity in a Compacted Alkaline Farmland of the Yellow River Floodplain
Sustainable crop residue management in alkaline agroecosystems is challenging due to trade-offs among carbon stabilization, nutrient availability, and microbial activity. To identify an optimal upcycling strategy for compacted alkaline farmland, a two-year wheat–maize rotation experiment in the Yellow River floodplain...