Biochar and degraded soil dataset

The study site is located at Lingchuan County, Guilin City, Guangxi Zhuang Autonomous Region, southwest China (25°11′46″N, 110°32′30″E). The soil at the site is classified as calcareous Cambisols developed from limestone. Long-term agricultural cultivation has led to soil degradation, characterized by decreased pH, heavy and clayey texture, and low organic matter content.we conducted field experiments with six treatments on typical degraded croplands , including: no fertilizer (CK), conventional fertilization (CF), CF plus sugarcane bagasse at 20 t ha⁻¹ or 40 t ha⁻¹, and CF plus sugarcane bagasse biochar at 20 t ha⁻¹ or 40 t ha⁻¹. Soil physicochemical properties, aggregate composition, tomato yield, and N₂O emission were monitored, and a ¹⁵N tracing technique was used to quantify soil N transformation rates. This dataset included soil physicochemical properties, soil aggregates, nitrous oxide emissions, and soil nitrogen transformation rates for each treatment.