Allelopathy refers to the beneficial or retardatory effect of one plant on another plant through the release of chemicals from plant parts by leaching, root exudation, volatilization, residue decomposition and other processes in both natural and agricultural system. Allelochemicals concentration in the producer plants may vary from each part. Allelopathic effect of different parts extract of Eclipta alba L. on seed germination and seedling growth of Melilotus alba Medik. was conducted under laboratory condition. The trial was replicated three times in completely randomized design with four concentrations (0.5, 1, 2 and 4%). Aqueous extracts of leaf, stem and root were prepared by soaking the powder of different parts in distilled water for a period of 24 h. The germination of seeds was recorded for 15 days and radical and plumule length were recorded. The result suggested that aqueous extract from leaves significantly inhibited not only the germination but also the radical and plumule length of seedlings. Stem and root extracts also suppress the germination and seedling growth as compared to control. However, treatment with higher concentration had negative effect on rate of germination, plumule length and radical length. Hence, it is suggested that E. alba L. has strong allelopathic potential and might be candidate for biological control of weeds.
Key words: Aqueous extract, biological control, Eclipta alba L., Melilotus alba Medik.
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