Influence of straw, compost, and biochar on soil carbon and aggregates in Chernozem

Yuhan Yuan, Chang Zhang, Yao Liang, Jingchao Yuan, Jianzhao Liu, Hongguang Cai and Jinjing Zhang
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Yuhan Yuan: Key Laboratory of Soil Resource Sustainable Utilization for Commodity Grain Bases of Jilin Province, College of Resource and Environmental Science, Jilin Agricultural University, Changchun, P.R. China
Chang Zhang: Institute of Agricultural Resources and Environments, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun, P.R. China
Yao Liang: Institute of Agricultural Resources and Environments, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun, P.R. China
Jingchao Yuan: Institute of Agricultural Resources and Environments, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun, P.R. China
Jianzhao Liu: Institute of Agricultural Resources and Environments, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun, P.R. China
Hongguang Cai: Institute of Agricultural Resources and Environments, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun, P.R. China
Jinjing Zhang: Key Laboratory of Soil Resource Sustainable Utilization for Commodity Grain Bases of Jilin Province, College of Resource and Environmental Science, Jilin Agricultural University, Changchun, P.R. China

Plant, Soil and Environment, 2025, vol. 71, issue 2, 148-160

Abstract: Crop residue management is a major concern in agricultural ecosystems. These residues can be recycled into biochar and compost to efficiently promote soil organic carbon (SOC) storage in farmlands. However, the influences of straw and its derived materials on SOC (especially on humus fractions) in soil aggregates of varying sizes are largely unknown. To understand these effects, a nine-year field experiment was conducted on calcareous black soil, including five treatments: CK - no fertiliser; NPK - mineral nitrogen, phosphorus, and potassium fertiliser; NPKS - NPK + straw; NPKC - NPK + compost, and NPKB - NPK + biochar. Compared to CK and NPK, the NPKS and NPKC treatments resulted in a noticeable rise (P < 0.05) in the proportion of aggregates with > 0.25 mm size (R0.25), as well as in the mean weight diameter and geometric mean diameter at 0-20 cm depth. The NPKS, NPKC, and NPKB treatments significantly (P < 0.05) increased the contents of large macroaggregates (> 2 mm), small macroaggregates (2~0.25 mm), microaggregates (0.25~0.053 mm), and non-aggregates in the 0-20 cm soil layer, as well as the levels of SOC, humic acid carbon (HAC) and humin carbon (HUC). These treatments also significantly (P < 0.05) enhanced organic carbon storage in the topsoil (0~20 cm). The effects were more pronounced after NPKB treatment relative to NPKS. Compared to CK, the application of mineral fertilisers alone and combined with organic materials significantly (P < 0.05) improved crop yields. The study's results indicate that the application of organic materials from corn significantly (P < 0.05) enhanced both soil quality and corn yield, with straw-derived biochar showing better effects on soil carbon sequestration.

Keywords: terrestrial ecosystem; soil stability; wet sieving; structural equation model (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:71:y:2025:i:2:id:580-2024-pse

DOI: 10.17221/580/2024-PSE

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