Abstract
Purpose
The objectives of the present paper were to (1) investigate the effect of compost tea on pakchoi; (2) illustrate the microbial community and metabolite variations under different aeration treatments and brewing time; and (3) figure out the response mechanism of compost tea to fermentation procedure.
Materials and methods
The effects of compost tea with varied compost/water ratio on pakchoi yield were investigated first. Then, compost tea under different aeration treatments (aerobic or anoxic treatment for 48 h and then switched aeration treatments for another 48 h) was conducted, and physicochemical properties and microbial community were analyzed. This study also investigated the effects of brewing time on microbial metabolisms when compost tea was fermented for 72 h in total with intermittent ventilation.
Results and discussion
It was interesting that compost tea could improve pakchoi yield by 46.59% compared to control treatment. Short-chain fatty acid (SCFA) was found noteworthy during compost tea fermentation, and its producers were key microbes in response to aeration conditions. It also was found that acetic acid (a typical SCFA) was prone to accumulation under anoxic conditions especially at earlier period of fermentation. The total fermentation process is suggested to be divided into three stages according to microbial metabolic characters including initial stage, exuberant stage, and mature stage, respectively. It was also found that vitamin B6 metabolism, which indirectly related to SCFA metabolism, played an important role during all the 3 stages.
Conclusions
SCFA was found noteworthy during compost tea fermentation, and its producers were the key microbes in response to aeration conditions. The total fermentation process is suggested to be divided into three stages according to microbial metabolic characters including initial stage, exuberant stage, and mature stage, respectively.
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Data availability
Data will be made available on request.
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Funding
This research was supported by the National Natural Science Foundation of China (31972943), the earmarked fund for CARS (China Agriculture Research System, CARS-29-ZP-10), and the China State Construction Engineering Corporation Technology Research and Development Project (CSCEC-2023-Z-21).
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Xiaoxing Wang: conceptualization, methodology, investigation, validation, data curation, visualization, and writing, original draft. Qihang Wei: conceptualization, methodology, investigation, validation, and data curation. Quansheng Zhao: methodology, data curation, and formal analysis. Xiayan Liu: formal analysis and writing, review and editing. Hui Deng: formal analysis, visualization, and validation. Zhaojun Li: conceptualization, funding acquisition, project administration, resources, and supervision.
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Wang, X., Wei, Q., Zhao, Q. et al. Short-chain fatty acid producers in compost tea as affected by brewing time and aeration condition. J Soils Sediments 23, 3096–3107 (2023). https://doi.org/10.1007/s11368-023-03542-7
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DOI: https://doi.org/10.1007/s11368-023-03542-7