International Journal on Science and Technology

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Role of Allelopathy in Enhancing Soil Microbial Activity, Nutrient Cycling, and Weed Suppression

Author(s) Dr. Gogikar SRI Bhagirath
Country India
Abstract Allelopathy plays a significant role in sustainable agriculture by influencing soil biological processes, nutrient dynamics, and weed suppression through the release of biologically active compounds from plants. Allelochemicals released from crop residues, roots, and decomposing plant materials interact with soil microorganisms, thereby enhancing microbial activity and enzyme functions that are essential for nutrient cycling. Studies on allelopathic crops such as sorghum, sunflower, rice, rye, and Brassica have demonstrated notable increases in soil microbial populations and enzymatic activities, including dehydrogenase and phosphatase, which contribute to improved soil health and fertility. These biological processes facilitate the availability of key nutrients such as nitrogen, phosphorus, and potassium, while also improving soil organic matter content.
In addition to their influence on soil processes, allelopathic interactions play a crucial role in weed sup-pression. Allelochemicals, particularly phenolic compounds, inhibit weed seed germination, root elonga-tion, and biomass accumulation, leading to a substantial reduction in weed density and growth. The use of allelopathic cover crops and mulches has been shown to provide effective short-term weed control while minimising reliance on synthetic herbicides. This approach not only reduces the risk of herbicide resistance but also supports environmentally friendly weed management practices.
The effectiveness of allelopathy is governed by multiple factors, including soil type, moisture, tempera-ture, and residue management practices, necessitating site-specific strategies for optimal results. Inte-grating allelopathic crops into cropping systems, either alone or in combination with reduced herbicide inputs, offers a cost-effective and ecologically sound approach to weed management while simulta-neously enhancing soil microbial activity and nutrient cycling. Overall, allelopathy represents a promising tool for improving agroecosystem sustainability and resilience.
Keywords Allelopathy, Weed Suppression, Soil Microbial Activity, Nutrient Cycling, Allelochemicals, Sustainable Agriculture, Cover Crops, Integrated Weed Management
Field Biology > Agriculture / Botany
Published In Volume 17, Issue 2, April-June 2026
Published On 2026-04-03
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