Role of Reductive Soil Disinfestation and Chemical Soil Fumigation on the Fusarium Wilt of Dioscorea batatas Decne Suppression

Qin Shao, Xiaopeng Li, Tian Zhao, Yiyang Wu, Liqin Xiang, Shengfu Pan, Zihan Guo and Liangliang Liu ()
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Qin Shao: College of Life Science and Environmental Resources, Yichun University, Yichun 336000, China
Xiaopeng Li: College of Life Science and Environmental Resources, Yichun University, Yichun 336000, China
Tian Zhao: College of Life Science and Environmental Resources, Yichun University, Yichun 336000, China
Yiyang Wu: College of Life Science and Environmental Resources, Yichun University, Yichun 336000, China
Liqin Xiang: College of Life Science and Environmental Resources, Yichun University, Yichun 336000, China
Shengfu Pan: College of Life Science and Environmental Resources, Yichun University, Yichun 336000, China
Zihan Guo: College of Life Science and Environmental Resources, Yichun University, Yichun 336000, China
Liangliang Liu: College of Life Science and Environmental Resources, Yichun University, Yichun 336000, China

Sustainability, 2023, vol. 15, issue 15, 1-15

Abstract: Reductive soil disinfestation (RSD) and chemical soil fumigation (CSF) comprise the most popular pre-planting soil management strategies. Their efficiency in suppressing several plant diseases in agricultural production systems has been compared. However, the disease-control effect of these methods on Fusarium wilt disease in Dioscorea batatas Decne ( D. batatas ) remains unclear. Importantly, dissimilarities in the impact of their bio-predictors on plant health have not been well characterized. Herein, four treatments, including no treatment (CK), RSD with gran chaff (GC-RSD) and molasses (MO-RSD), and CSF with dazomet (DA-CSF), were performed in a pot experiment using D. batatas -diseased soil. Compared with the CK treatment, the Fusarium oxysporum population significantly decreased by 88.89–97.78% following the DA-CSF, GC-RSD, and MO-RSD treatments. The bacterial community and functional composition of the soil were considerably altered by these treatments. However, the incidence of Fusarium wilt disease in D. batatas was significantly decreased in the two RSD-treated soils, rather than in DA-CSF-treated soils. Bacterial α-diversity and population as well as some key nitrogen-related functional gene expressions as bio-predictors were significantly lower in DA-CSF-treated soil than in RSD-treated soil. In particular, the core (e.g., Azotobacter , Phenylobacterium , Clostridium , Bradyrhizobium , Microvirga , and Caulobacter ) and unique (e.g., Pseudomonas , Brevundimonas , Flavobacterium , Ochrobactrum , and Sphingobacterium ) functional microbiomes in RSD-treated soil exerted a positive impact on soil functional composition of the soil and plant growth. Taken together, our results indicate that RSD outperformed CSF in promoting plant health by regulating the bacterial community and functional composition.

Keywords: Dioscorea batatas Decne; bio-predictors; fusarium wilt; microbial community; core microbiome; unique microbiome; nitrogen functional genes (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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