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Optimization, application effects and improved microecology of a composite microbial agent containing oyster shells.

Ya-Ting Yang¹, Xin-Peng Li¹, Li-Cheng Gao¹

¹State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, Shandong, People's Republic of China.

Scientific Reports

|February 26, 2025

Summary

This study developed a composite microbial agent from oyster shell waste to improve plant growth and soil health. The agent enhanced crop yield and fruit quality while increasing beneficial soil microbial diversity and abundance.

Keywords:

Beauveria bassiana Composite microbial agent Oyster shell Soil Microbiome

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Area of Science:

Agricultural Science
Environmental Science
Microbiology

Background:

Oyster shells are a significant marine waste product, causing ecosystem pollution.
Valorizing oyster shells can mitigate environmental issues and create valuable products.

Purpose of the Study:

To develop a composite microbial agent using calcined oyster shell powder, Beauveria bassiana, and chitosan.
To optimize the agent's application ratio for plant growth using tomato indicators.
To evaluate the agent's impact on vineyard crop quality and soil microbial communities.

Main Methods:

Oyster shells were calcined to activate their components.
A composite agent was formulated with calcined oyster shell powder, Beauveria bassiana spores, and chitosan.
Tomato plants were used to determine the optimal agent ratio.
The optimized agent was applied to vineyards to assess its effects on crop yield and soil microbes.

Main Results:

The composite agent significantly increased 100-grain weight (10.55%), carotenoids (8.71%), and total amino acids (29.40%) in vineyards.
Soil microbial population analysis revealed increased abundance and diversity after agent application.
The agent promoted bacterial amino acid and polysaccharide metabolism in the soil.

Conclusions:

The developed composite microbial agent effectively utilizes oyster shell waste.
The agent enhances plant growth, improves fruit quality, and enriches soil microbial ecosystems.
This approach offers a sustainable solution for waste management and agricultural enhancement.