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<p>With the growing importance of adopting biofertilizers management and crop residue addition to combat sustainability issues and carbon (C) sequestration, the present study was conducted in a 12&#xa0;years long-term rice–wheat cropping system. The study aimed to evaluate the effect of tillage, crop residue, and biofertilizers on C sequestration and different sensitive C pools in the acid alluvial soil of the lower Indo-Gangetic plain of India. For comparison, 3rd and 12th cropping cycle data of eight treatment combinations [tillage (zero tillage (ZT) and conventional tillage (CT)), crop residues, and biofertilizers application] were used. Soil sampling after wheat crop harvest was done at two layers 0–5&#xa0;cm and 5–20&#xa0;cm. Results revealed that after 9&#xa0;years, soil organic C (SOC) content improved significantly due to changes in tillage practices from CT to ZT by 3.6% and 2.1% in the soil depths of 0–5&#xa0;cm and 5–20&#xa0;cm, respectively, and also by residue addition (8.6% and 2.4% in the above-mentioned respective depths). Similarly, SOC increased on biofertilizers addition in 0–5&#xa0;cm by 0.6%, however, declined in 5–20&#xa0;cm by 0.2% significantly. C sequestration and CO<sub>2</sub> equivalent emissions were highest in the treatment applied with a combination of CT, residue, and biofertilizers compared to all treatment combinations by 0.86 and 3.15&#xa0;Mg&#xa0;ha<sup>−1</sup>, respectively. Biofertilizers applied with crop residue had significantly higher C sequestration compared to biofertilizers applied without crop residue. Labile C pools: active C (AC), hot water-soluble C (HWSC), particulate organic C (POC), and microbial biomass C (MBC) were also increased from changing tillage practices CT to ZT and with or without residue and biofertilizers addition. Overall, this study concludes that in acid alluvial soil, long-term tillage, and crop residue with biofertilizers impact soil sustainability and result in improved C pools and C sequestration.</p>

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Addition of biofertilizers with crop residue in conservation agriculture improves soil carbon sequestration: a long-term field study

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Dewali Roy,
  • A. K. Sinha,
  • S. Rakesh,
  • K. K. Rao,
  • S. Sahoo,
  • P. M. Bhattacharya,
  • B. Mitra,
  • P. Mukhopadhyay,
  • Rajeev Padbhushan

摘要

With the growing importance of adopting biofertilizers management and crop residue addition to combat sustainability issues and carbon (C) sequestration, the present study was conducted in a 12 years long-term rice–wheat cropping system. The study aimed to evaluate the effect of tillage, crop residue, and biofertilizers on C sequestration and different sensitive C pools in the acid alluvial soil of the lower Indo-Gangetic plain of India. For comparison, 3rd and 12th cropping cycle data of eight treatment combinations [tillage (zero tillage (ZT) and conventional tillage (CT)), crop residues, and biofertilizers application] were used. Soil sampling after wheat crop harvest was done at two layers 0–5 cm and 5–20 cm. Results revealed that after 9 years, soil organic C (SOC) content improved significantly due to changes in tillage practices from CT to ZT by 3.6% and 2.1% in the soil depths of 0–5 cm and 5–20 cm, respectively, and also by residue addition (8.6% and 2.4% in the above-mentioned respective depths). Similarly, SOC increased on biofertilizers addition in 0–5 cm by 0.6%, however, declined in 5–20 cm by 0.2% significantly. C sequestration and CO2 equivalent emissions were highest in the treatment applied with a combination of CT, residue, and biofertilizers compared to all treatment combinations by 0.86 and 3.15 Mg ha−1, respectively. Biofertilizers applied with crop residue had significantly higher C sequestration compared to biofertilizers applied without crop residue. Labile C pools: active C (AC), hot water-soluble C (HWSC), particulate organic C (POC), and microbial biomass C (MBC) were also increased from changing tillage practices CT to ZT and with or without residue and biofertilizers addition. Overall, this study concludes that in acid alluvial soil, long-term tillage, and crop residue with biofertilizers impact soil sustainability and result in improved C pools and C sequestration.