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Purpose <p>In the Hetao Irrigation District, where irrigation water is scarce, the absence of nature-based, efficient, green amendments hampers efforts to remediate saline soils. Halotolerant microorganisms (HM) isolated from saline-alkaline soil can enhance soil fertility and reduce salinity and alkalinity, but their performance in combination with agricultural waste-derived biostimulants remains underexplored.</p> Materials and methods <p>In the present study, two individual strains, <i>Bacillus velezensis</i> ANB1 and <i>Streptomyces rochei</i> D74, were separately applied with the biostimulants myo-inositol (MI) and corn steep liquor (CSL; waste-derived) to two saline–alkaline soils. Their effects on the changing patterns of soil physicochemical, enzyme activity and soil quality were investigated after a 60-day soil culture experiment.</p> Results <p>The results reveal that inoculation with either ANB1 or D74, with or without biostimulants, reduced soil salinity and alkalinity while increasing nutrient contents and enzymatic activities to varying degrees. For instance, relative to the CK, D74 applied alone decreased alkaline-hydrolyzable nitrogen (AH-N) from 83.5&#xa0;mg/kg to 96.2&#xa0;mg/kg in high-salinity soil. However, combining ANB1/D74 with MI/CSL yielded synergistic effects on boosting these nutrients and enzymatic activities. In high-salinity soil, relative to D74 alone, co-application of MI with D74 increased soil AH-N by 10.2% (from 96.2 to 106&#xa0;mg/kg), and CSL with D74 increased it by 8.1% (from 96.2 to 104&#xa0;mg/kg).</p> Conclusion <p>These findings provide both theoretical and practical guidance for improving soil quality and recovering productivity in saline–alkaline lands sustainably through the combined use of HM and biostimulants.</p>

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Synergistic amelioration effect of halotolerant microorganisms and biostimulants on saline-alkaline soil in the Hetao Irrigation District

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Qiannuo Mi,
  • Xiaomin Wei,
  • Qing Chen,
  • Erzhen li,
  • Jianhua Guo,
  • Yuehua Mi,
  • Yiyao Wu,
  • Yan Wu

摘要

Purpose

In the Hetao Irrigation District, where irrigation water is scarce, the absence of nature-based, efficient, green amendments hampers efforts to remediate saline soils. Halotolerant microorganisms (HM) isolated from saline-alkaline soil can enhance soil fertility and reduce salinity and alkalinity, but their performance in combination with agricultural waste-derived biostimulants remains underexplored.

Materials and methods

In the present study, two individual strains, Bacillus velezensis ANB1 and Streptomyces rochei D74, were separately applied with the biostimulants myo-inositol (MI) and corn steep liquor (CSL; waste-derived) to two saline–alkaline soils. Their effects on the changing patterns of soil physicochemical, enzyme activity and soil quality were investigated after a 60-day soil culture experiment.

Results

The results reveal that inoculation with either ANB1 or D74, with or without biostimulants, reduced soil salinity and alkalinity while increasing nutrient contents and enzymatic activities to varying degrees. For instance, relative to the CK, D74 applied alone decreased alkaline-hydrolyzable nitrogen (AH-N) from 83.5 mg/kg to 96.2 mg/kg in high-salinity soil. However, combining ANB1/D74 with MI/CSL yielded synergistic effects on boosting these nutrients and enzymatic activities. In high-salinity soil, relative to D74 alone, co-application of MI with D74 increased soil AH-N by 10.2% (from 96.2 to 106 mg/kg), and CSL with D74 increased it by 8.1% (from 96.2 to 104 mg/kg).

Conclusion

These findings provide both theoretical and practical guidance for improving soil quality and recovering productivity in saline–alkaline lands sustainably through the combined use of HM and biostimulants.