Key Takeaways
- Combining rapeseed biofumigation and biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More significantly improves soil fertility by increasing available phosphorus, available potassium, total nitrogen, and cation exchange capacity.
- The treatment effectively controls continuous cropping obstacles, reducing the wilt disease index significantly compared to untreated control soil.
- Plant height and cumulative flower yield increase notably under the combined amendment regime.
- Rhizosphere bacterial diversity and community composition are substantially modified, with particular enrichment of beneficial or oligotrophic bacterial taxa such as Acidobacteriota and MND1.
- Soil enzymatic activities, including catalase, sucrase, and alkaline phosphatase, experience notable enhancements that support better nutrient cycling and organic matter turnover.
Long-term monoculture often degrades soil structure, causes nutrient imbalances, and triggers severe soil-borne plant diseases that restrict the sustainable commercial production of medicinal and edible flowers. Traditional chemical treatments carry environmental and resistance risks, highlighting the critical need for green, sustainable biological management strategies that restore soil health without relying exclusively on synthetic fungicides.
To address these ongoing challenges, researchers conducted a field experiment in an area with eight years of continuous chrysanthemum cultivation, evaluating a blank control, rapeseed biofumigation alone, and biofumigation combined with corn-straw biochar. The study assessed changes across soil physicochemical properties, enzyme activities, disease severity, flower yield, and rhizosphere bacterial and fungal communities.
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The results demonstrated that the combined application significantly boosted available phosphorus by over forty percent, available potassium by over sixteen percent, and total nitrogen, alongside increasing key soil enzyme activities. Furthermore, both biofumigation treatments significantly lowered the wilt disease index from 8.67 down to 2.67 and 2.33, respectively, while the combined biochar treatment achieved a 6.46 percent increase in total flower yield and enhanced plant height. High-throughput sequencing revealed that these agronomic improvements were accompanied by distinct shifts in bacterial community structure, marked by the enrichment of specific taxa linked to nutrient cycling. The authors conclude that integrating biofumigation and biochar offers a promising green strategy for mitigating continuous cropping obstacles, though multi-site and multi-season validations remain necessary before broader regional adoption.
Source: Yao, Z., Shi, G., Xi, K., Qiu, Y., Tao, M., Shen, F., Wang, W., & Liu, Z. (2026). Rapeseed biofumigation combined with biochar mitigates continuous-cropping obstacles in chrysanthemum via soil improvement, rhizosphere microbial-community modification, and wilt disease reduction. Microorganisms, 14(10), 2383.
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