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Synergistic Effects of Deep Rotary Tillage and Microbial Decomposition Agents on Straw Decomposition, Soil Nutrient Dynamics, and Microbial Communities in Rice Systems

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  • Xinyue Wang

    (College of Agriculture, Hunan Agricultural University, Changsha 410125, China)

  • Jie Huang

    (College of Agriculture, Hunan Agricultural University, Changsha 410125, China)

  • Yanting Tan

    (College of Agriculture, Hunan Agricultural University, Changsha 410125, China)

  • Lili Yang

    (College of Plant Protection, Hunan Biological and Electromechanical Polytechnic, Changsha 410125, China)

  • Yuanhuan Li

    (College of Plant Protection, Hunan Biological and Electromechanical Polytechnic, Changsha 410125, China)

  • Bing Xia

    (College of Agriculture, Hunan Agricultural University, Changsha 410125, China)

  • Hailin Li

    (College of Agriculture, Hunan Agricultural University, Changsha 410125, China)

  • Xiaohua Deng

    (College of Agriculture, Hunan Agricultural University, Changsha 410125, China)

Abstract

This study evaluated the synergistic effects of microbial decomposition agents and deep rotary tillage on rice straw decomposition, soil nutrient dynamics, and microbial communities in paddy fields of southern China. A two-factor randomized block experiment was conducted, with straw decomposition dynamics modeled using a modified Olson decay model, and microbial communities were assessed via high-throughput sequencing and network analysis. The combined treatment significantly increased the decomposition rate constant, reduced the time for 50% decomposition to 81 days, and enhanced soil nutrient availability, especially total nitrogen, phosphorus, and potassium. Microbial richness, diversity, and network complexity were also improved. Structural equation modeling indicated that nutrient availability, rather than microbial α-diversity, was the main driver of decomposition processes. These findings suggest that integrating microbial agents with deep tillage offers an effective strategy for optimizing straw return, improving soil fertility, and enhancing microbial functional resilience in rice systems.

Suggested Citation

  • Xinyue Wang & Jie Huang & Yanting Tan & Lili Yang & Yuanhuan Li & Bing Xia & Hailin Li & Xiaohua Deng, 2025. "Synergistic Effects of Deep Rotary Tillage and Microbial Decomposition Agents on Straw Decomposition, Soil Nutrient Dynamics, and Microbial Communities in Rice Systems," Agriculture, MDPI, vol. 15(13), pages 1-18, July.
    • Handle: RePEc:gam:jagris:v:15:y:2025:i:13:p:1447-:d:1695125
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    References listed on IDEAS

    as
    1. Yuanyi Shang & Wenju Chen & Fang Li & Shiying Li & Yanlai Han & Peipei Li, 2024. "Effects of Tillage Depth and Lime Application on Acidification Reduction and Nutrient Availability in Vertisol Soil," Agriculture, MDPI, vol. 14(10), pages 1-18, October.
    2. Zeyu Tang & Xiaoyu Zhang & Ruxin Chen & Chaomin Ge & Jianjun Tang & Yanqiang Du & Peikun Jiang & Xiaobo Fang & Huabao Zheng & Cheng Zhang, 2024. "A Comprehensive Assessment of Rice Straw Returning in China Based on Life Cycle Assessment Method: Implications on Soil, Crops, and Environment," Agriculture, MDPI, vol. 14(7), pages 1-16, June.
    3. Ogechukwu Bose Chukwuma & Mohd Rafatullah & Husnul Azan Tajarudin & Norli Ismail, 2021. "A Review on Bacterial Contribution to Lignocellulose Breakdown into Useful Bio-Products," IJERPH, MDPI, vol. 18(11), pages 1-27, June.
    4. Cuixia Yun & Changrong Yan & Yinghao Xue & Zhiyu Xu & Tuo Jin & Qin Liu, 2021. "Effects of Exogenous Microbial Agents on Soil Nutrient and Microbial Community Composition in Greenhouse-Derived Vegetable Straw Composts," Sustainability, MDPI, vol. 13(5), pages 1-15, March.
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