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Integrated Effects of Co-Inoculation with Phosphate-Solubilizing Bacteria and N 2 -Fixing Bacteria on Microbial Population and Soil Amendment Under C Deficiency

Author

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  • Zhikang Wang

    (Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China)

  • Ziyun Chen

    (Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China)

  • Xiangxiang Fu

    (Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China)

Abstract

The inoculation of beneficial microorganisms to improve plant growth and soil properties is a promising strategy in the soil amendment. However, the effects of co-inoculation with phosphate-solubilizing bacteria (PSB) and N 2 -fixing bacteria (NFB) on the soil properties of typical C-deficient soil remain unclear. Based on a controlled experiment and a pot experiment, we examined the effects of PSB (M: Bacillus megaterium and F: Pseudomonas fluorescens ), NFB (C: Azotobacter chroococcum and B: Azospirillum brasilence ), and combined PSB and NFB treatments on C, N, P availability, and enzyme activities in sterilized soil, as well as the growth of Cyclocarya Paliurus seedlings grow in unsterilized soil. During a 60-day culture, prominent increases in soil inorganic N and available P contents were detected after bacteria additions. Three patterns were observed for different additions according to the dynamic bacterial growth. Synergistic effects between NFB and PSB were obvious, co-inoculations with NFB enhanced the accumulation of available P. However, decreases in soil available P and N were observed on the 60th day, which was induced by the decreases in bacterial quantities under C deficiency. Besides, co-inoculations with PSB and NFB resulted in greater performance in plant growth promotion. Aimed at amending soil with a C supply shortage, combined PSB and NFB treatments are more appropriate for practical fertilization at intervals of 30–45 days. The results demonstrate that co-inoculations could have synergistic interactions during culture and application, which may help with understanding the possible mechanism of soil amendment driven by microorganisms under C deficiency, thereby providing an alternative option for amending such soil.

Suggested Citation

  • Zhikang Wang & Ziyun Chen & Xiangxiang Fu, 2019. "Integrated Effects of Co-Inoculation with Phosphate-Solubilizing Bacteria and N 2 -Fixing Bacteria on Microbial Population and Soil Amendment Under C Deficiency," IJERPH, MDPI, vol. 16(13), pages 1-15, July.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:13:p:2442-:d:246871
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    References listed on IDEAS

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    2. Yin, Huajun & Zhao, Wenqiang & Li, Ting & Cheng, Xinying & Liu, Qing, 2018. "Balancing straw returning and chemical fertilizers in China: Role of straw nutrient resources," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 2695-2702.
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