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The Crop Residue Removal Threshold Ensures Sustainable Agriculture in the Purple Soil Region of Sichuan, China

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Listed:
  • Peng Zhang

    (State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610000, China
    These authors contributed to the work equally and should be regarded as co-first authors.)

  • Yuxin He

    (State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610000, China
    These authors contributed to the work equally and should be regarded as co-first authors.)

  • Tao Ren

    (Ministry of Agriculture of the People’s Republic of China, Wuhan 430000, China)

  • Yang Wang

    (State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610000, China)

  • Chao Liu

    (State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610000, China)

  • Naiwen Li

    (State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610000, China)

  • Longguo Li

    (State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610000, China)

Abstract

Sichuan, a hilly area in southwestern China, is recommended as a bioethanol production base because of its abundant crop residue resources. However, removing the crop straw for bioethanol may negatively affect soil fertility and productivity due to the local purple soil vulnerability. To explore the impact of crop residue removal on soil fertility and productivity and meet the needs of sustainable agriculture, we conducted a crop residue removal experiment by measuring the soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) contents, and crop yield in the purple soil region in southwest China. Soil erosion was also simulated by Revised Universal Soil Loss Equation version 2 (RUSLE 2). The results showed that soil erosion increased with the increase of the straw removal rate. Compared with 0% removal treatment, the SOC content reduced at other removal rate treatments, especially for long-term residue removal. The effect of residue removal on soil TN and TP was not consistent within one year. After two years, residue removal greater than 25% caused a decrease in TN by 1.6–3.7%, and straw removal greater than 50% caused a TP decrease by 8.5–9.3%. More than 25% of the residue removed reduced maize and canola yields, and TN and TP content. However, all crop residue removal treatments resulted in SOC content reduction and soil erosion deterioration. In conclusion, crop residue removal was not recommended due to agricultural sustainability in Sichuan, China.

Suggested Citation

  • Peng Zhang & Yuxin He & Tao Ren & Yang Wang & Chao Liu & Naiwen Li & Longguo Li, 2021. "The Crop Residue Removal Threshold Ensures Sustainable Agriculture in the Purple Soil Region of Sichuan, China," Sustainability, MDPI, vol. 13(7), pages 1-16, March.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:7:p:3799-:d:526545
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    References listed on IDEAS

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