Allelopathy refers to the biochemical phenomenon in which plants release specialized compounds into their surroundings that inhibit or promote the growth, survival, and reproduction of neighboring plants. This process underpins companion planting strategies, where crops are deliberately paired to exploit beneficial allelopathic interactions—such as suppressing weeds or deterring pests—while avoiding harmful ones that stunt growth. Understanding these chemical signaling networks helps researchers design more sustainable, ecologically informed agricultural systems that reduce reliance on synthetic herbicides and pesticides.
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.
3
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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