Allelopathy is the phenomenon by which plants release chemical compounds into their environment that influence the growth, survival, or reproduction of neighboring plants. In companion planting, this principle is applied strategically to arrange plant combinations that exploit these biochemical interactions — either to suppress weeds, deter pests, or enhance the growth of neighboring crops. Understanding the molecular mechanisms behind allelopathic interactions is an active area of plant science research, with implications for developing sustainable agricultural systems that reduce dependence on synthetic herbicides and fertilizers.
Sorghum plants release natural chemicals that suppress the growth of neighboring crops — and this effect gets stronger the more sorghum material is present. The study tested this across eight crops under drought conditions, finding that legumes like alfalfa and cowpea were most vulnerable, while sorghum itself was most resilient.
1
Sorghum aqueous extracts at concentrations of 2–8% caused clear, dose-dependent reductions in germination and seedling growth across all eight crop species tested.
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Alfalfa and cowpea were the most sensitive crops, showing the greatest suppression under combined allelopathic and drought stress, and were excluded from the greenhouse phase.
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Sorghum showed the greatest self-tolerance among all tested crops when exposed to its own root residues under drought conditions, suggesting a competitive advantage in mixed or rotated systems.
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