Canadian scientists demonstrate improved yields and disease control through integrated soil treatments.
A recent study published in Frontiers in Soil Science has unveiled promising strategies to enhance potato yields and mitigate Rhizoctonia canker, a prevalent soil-borne disease affecting potato crops. The research, conducted by a team from the Institut de Recherche et de Développement en Agroenvironnement (IRDA) and Université Laval in Québec, Canada, explored the effects of chloropicrin soil fumigation and biostimulant application on potato health and soil fungal communities.
Research Overview
The study, titled “High-Throughput Sequencing Metabarcoding and Network Analysis Elucidate the Effects of Soil Fumigation and Biostimulant on Potato Yield, Rhizoctonia Canker, and Fungal Community”, was authored by Honoré Tekeu (IRDA and Université Laval), Joel D’Astous-Page (IRDA), Thomas Jeanne (IRDA), and Richard Hogue (IRDA). It is part of the journal’s Soil Biology, Ecosystems and Biodiversity section and contributes to the research topic Expert Opinions: Save the Microbes to Save the Planet.
Key Findings
- Yield Improvement: Application of chloropicrin fumigation alone resulted in a 7.06% increase in gross potato yield (23.5 cwt/acre) compared to untreated controls. When combined with a Bacillus species-based biostimulant, the yield improvement rose to 8.41% (28 cwt/acre).
- Disease Suppression: Control plots experienced net yield losses exceeding 20% due to Rhizoctonia canker. Both fumigation and the combined treatment reduced the disease index by 30%, limiting yield losses to less than 5.6%.
- Soil Fungal Dynamics: Fumigation alone decreased fungal abundance during the growing season. However, the addition of the biostimulant slightly increased both the mean and variability of fungal abundance. Diversity indices such as Shannon and Evenness decreased in fumigated plots, while the biostimulant increased the variability of Chao1 and Observed ASVs indices throughout the season.
Implications for Sustainable Agriculture
The study highlights the potential of integrating chemical and biological soil treatments to enhance crop yields and suppress soil-borne diseases. The use of biostimulants, in particular, offers a promising avenue for maintaining soil microbial diversity, which is crucial for long-term soil health and sustainability.
Accessing the Full Study
The full research article will be published in Frontiers in Soil Science, Volume 5, 2025 soon. Interested readers can access the abstract in the meantime at: https://www.frontiersin.org/journals/soil-science/articles/10.3389/fsoil.2025.1559144/abstract.
Source: Frontiers in Soil Science
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