Allelopathy refers to the biochemical process by which plants release compounds into the environment that inhibit or promote the growth of neighboring species, while intercropping is the agricultural practice of growing two or more crops together to exploit such interactions and other complementary traits. Together, these concepts help researchers understand chemical communication and competition between plant species, revealing how root exudates and other secondary metabolites shape community dynamics. This knowledge is critical for designing sustainable planting systems that naturally suppress weeds and pests, improve nutrient use efficiency, and boost overall crop yields without heavy reliance on synthetic inputs.
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.
2
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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