Effect of microbial transformation induced by metallic compound additives and temperature variations during composting on suppression of soil-borne pathogens

Ruixue Chang; Yuting Li; Naihui Li; Xuehong Wu; Qing Chen

doi:10.1016/j.jenvman.2020.111816

Effect of microbial transformation induced by metallic compound additives and temperature variations during composting on suppression of soil-borne pathogens

J Environ Manage. 2021 Feb 1:279:111816. doi: 10.1016/j.jenvman.2020.111816. Epub 2020 Dec 13.

Authors

Ruixue Chang¹, Yuting Li², Naihui Li³, Xuehong Wu⁴, Qing Chen⁵

Affiliations

¹ Beijing Key Laboratory of Farmyard Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China; College of Plant Protection, China Agricultural University, Beijing, 100193, China. Electronic address: changrui.xue@163.com.
² Beijing Key Laboratory of Farmyard Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China; College of Plant Protection, China Agricultural University, Beijing, 100193, China.
³ College of Horticulture, Northeast Agricultural University, Harbin, 150038, China.
⁴ College of Plant Protection, China Agricultural University, Beijing, 100193, China.
⁵ Beijing Key Laboratory of Farmyard Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China. Electronic address: qchen@cau.edu.cn.

PMID: 33321350
DOI: 10.1016/j.jenvman.2020.111816

Abstract

Agricultural wastes can be modified by composting and reused in soil to suppress soil-borne pathogens, which was proved to be closely related with microbial parameters. However, the microbial community in compost can be directly altered by temperature variations and metallic compound additives during composting process. The present study collected samples in various stages of the 35-day composting process, in which a study control (no additives) and different metallic compound additives, including magnesium oxide (MgO), alum (AlK(SO₄)₃), calcium oxide (CaO) and ferrous sulfate (FeSO₄), were set in the bespoke compost with cow dung and corn stalk. The results showed that the additives prolonged the composting maturity process, whereas no consistent influence on the temperature variation and microbial community was observed. Temperature variations during composting significantly varied the bacteria and fungi diversity and community, especially the bacteria phyla of Firmicutes and Proteobacteria, while the bacteria were shown similar in Day 14 and Day 35 by PCA analysis. Meanwhile the samples from Day 14 and Day 35 showed stable suppressive effects on R. solani. and F. oxysporum, especially in D14 shown as 73.12%-88.16% and 30.95-58.55%, respectively, which were significantly related with the phyla of Firmicutes and Proteobacteria. In conclusion, temperature variations during composting process had a more significant impact than metallic compound additives on the microbial community and diversity, which resulted in significantly influence on the pathogen suppression. Suitable composting duration could produce effective suppressive products on soil-borne pathogens, for which further study was needed.

Keywords: Composting; Metallic compound; Microbial community; Soil-borne pathogens; Suppressive effects; Temperature variation.

MeSH terms

Composting*
Microbiota*
Soil
Soil Microbiology
Temperature

Substances

Soil