Nature of interference potential of hairy vetch (Vicia villosa Roth) to radish (Raphanus sativus L.): does allelopathy play any role?
2001
Inderjit. | Asakawa, C.
Laboratory bioassays were conducted to understand whether allelopathy plays any role as a potential mechanism of interference by hairy vetch (Vicia villosa Roth) in seedling growth of radish (Raphanus sativus L.). Seeds were sown in: (i) monoculture of radish, (ii) mixed culture of radish and hairy vetch, and (iii) monoculture of hairy vetch. Experiments were conducted to investigate: (1) the influence of plant age of hairy vetch seedlings, N fertilizer and light regime on interference potential of hairy vetch, and (2) the influence of these parameters on water-soluble phenolic content of the medium. In general, hairy vetch suppressed the root length of radish, but these inhibitory effects were eliminated when medium was supplemented with N fertilizer. Shoot height of radish was not affected by either treatment. No difference in the levels of inhibition of radish or phenolic content was recorded with two light regimes. The present study suggests that growth inhibition of radish seedling may not be due to phenolics leached by hairy vetch, and allelopathy cannot be invoked.
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