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1. Allelopathic compounds are released directly or indirectly into the rhizosphere by leaching, residue incorporation and decomposition, volatilization, root exudates etc. Research indicates that bio chemical interaction takes place when allelochemicals produced by one plant escape into environment and influence the growth and development of another plant.
2. Demonstrating allelopathic phenomenon is difficult because of the complexity of events involved. Laboratory bioassays are important because they allow researchers to study large amounts of plant materials in a short time. They also allow researchers to eliminate interference factors other than the one under study.
3. The allelopathic potential of a rice cultivar depends on agricultural practices, soil characteristics and environmental conditions and these plant interference components operate sequentially and simultaneously. These must be considered when studying interference mechanisms of rice cultivars.
Weed Management in Rice, DRR Training Manual