Compost-derived indole-3-acetic-acid-producing bacteria and their effects on enhancing the secondary fermentation of a swine manure-corn stalk composting

Guanjing Cai, Junjie Li, Mingdian Zhou, Gefu Zhu*, Yanlin Li, Nan Lv, Ruming Wang, Chunxing Li, Xiaofang Pan

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Composting, as an effectively bio-oxidative process, has been widely used for converting organic waste to organic fertilizer. However, the low fertilizer efficiency of composting product limited its application in agriculture. To improve the growth-promoting effect of composting product, the present study investigated the bioaugmentation strategy of inoculating indole-3-acetic-acid (IAA)-producing bacteria. Firstly, two IAA-producing bacteria (Bacillus safensis 33C and Rhodococcus rhodochrous YZ) were isolated from composting products with high IAA yields of 39.18 and 16.32 μg·mL-1, respectively. Secondly, the microbial inoculants were prepared with 33C, YZ and a previously isolated IAA-producing strain Corynebacterium stationis 29B. To increase the accumulation of microbial secondary metabolites, microbial inoculants were amended at the secondary fermentation stage of composting. Physicochemical characterization showed that the maturity of composting product was significantly promoted by inoculating microbial inoculants prepared with 33C and 29B (single and combined inoculants). Finally, bioaugmentation with 33C and 29B increased the IAA contents of composting products by 2.9-5.2 times, which benefited the germination and early vegetative growth of plants. In summary, inoculating proper IAA-producing bacteria during secondary fermentation of composting could improve the quality of composting product and expand its application.
Original languageEnglish
Article number132750
JournalChemosphere
Volume291
Number of pages9
ISSN0045-6535
DOIs
Publication statusPublished - 2022

Keywords

  • IAA-Producing bacteria
  • Composting
  • Secondary fermentation
  • Growth-promoting effect

Fingerprint

Dive into the research topics of 'Compost-derived indole-3-acetic-acid-producing bacteria and their effects on enhancing the secondary fermentation of a swine manure-corn stalk composting'. Together they form a unique fingerprint.

Cite this