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Background and aims <p>Incorporating legumes into crop rotations is a well-known practice for enhancing subsequent crop yields through nitrogen (N) effects. However, limited attention has been given to the underlying microbial mechanisms. In this study, we investigated the soil diazotrophic communities and triticale yields of two rotation systems: winter triticale-summer maize (MT) and alfalfa-winter triticale (AT) in the saline-alkaline soil of the Yellow River Delta.</p> Results <p>Our results showed that AT significantly increased triticale yields by an average of 53%, along with higher diazotrophic community diversity and evenness. Non-metric multidimensional scaling (NMDS) analysis revealed a significant divergence in diazotrophic community structure between the MT and AT rotation systems. Moreover, multiple regression analysis showed that diazotrophic community diversity (α- and β-diversity) as well as soil properties (e.g. soil nitrogen) explained 61.5% and 14.5% of triticale yield variation, respectively. The random forest analysis showed some bacterial genera, such as <i>Anaeromyxobacter</i>, <i>Bradyrhizobium</i>, <i>Geoalkalibacter</i>, <i>Sinorhizobium</i>, and <i>Azoarcus</i> were key drivers of triticale yield.</p> Conclusions <p>Our research highlights the potential of legume incorporation in crop rotations to enhance subsequent crop yields by modulating diazotrophic communities.</p>

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Improving triticale yield with alfalfa in saline-alkaline soil: effects on diazotrophic communities in the Yellow River Delta

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Jinglei Zhang,
  • Bo Wu,
  • Mingjiang Liu,
  • Yuan Jia,
  • Lele Kang,
  • Guoliang Wang

摘要

Background and aims

Incorporating legumes into crop rotations is a well-known practice for enhancing subsequent crop yields through nitrogen (N) effects. However, limited attention has been given to the underlying microbial mechanisms. In this study, we investigated the soil diazotrophic communities and triticale yields of two rotation systems: winter triticale-summer maize (MT) and alfalfa-winter triticale (AT) in the saline-alkaline soil of the Yellow River Delta.

Results

Our results showed that AT significantly increased triticale yields by an average of 53%, along with higher diazotrophic community diversity and evenness. Non-metric multidimensional scaling (NMDS) analysis revealed a significant divergence in diazotrophic community structure between the MT and AT rotation systems. Moreover, multiple regression analysis showed that diazotrophic community diversity (α- and β-diversity) as well as soil properties (e.g. soil nitrogen) explained 61.5% and 14.5% of triticale yield variation, respectively. The random forest analysis showed some bacterial genera, such as Anaeromyxobacter, Bradyrhizobium, Geoalkalibacter, Sinorhizobium, and Azoarcus were key drivers of triticale yield.

Conclusions

Our research highlights the potential of legume incorporation in crop rotations to enhance subsequent crop yields by modulating diazotrophic communities.