Humic acid biosynthesis and bacterial community evolution during aerobic composting of rice straw.

Notably, Brevundimonas showed highly significant positive correlation with TOC content ( p < 0.01), but an opposite phenomenon was observed between it and HA content.

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At the end of the composting, the HA yield demonstrated an increasing trend with an initial decrease in the substrate particle size from 4.75 mm to 0.83 mm, and a subsequent decrease trend with further decrease in the substrate particle size to 0.25 mm.

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