Allelopathy Journal

Allelopathic effects of Eucalyptus citriodora Hook, were investigated on germination, plant growth, nodulation, yield and arbuscular mycorrhizal (AM) colonization in Vigna radiata (L) Wilczek. In aqueous extract bioassays, 60% aqueous extract delayed the seed germination. However, the final germination percentage was not significantly affected by aqueous extracts. Shoot length of seedlings was gradually suppressed by increase in the extract concentration from 10–50% yet shoot biomass was enhanced insignificantly in 10 and 20% extract as compared to control. Adverse effect of 40 and 50% extract was significant. Root length was increased by 10% extract while 40 and 50% extracts significantly suppressed the studied parameters. Root dry biomass was enhanced by all the extract concentrations. Effect was more pronounced in 30% than the rest of the extract treatments. In pot experiment 1,2 and 3% aqueous extract and leaf mixing treatments generally supported plant growth, nodulation and yield. Mycorrhizal colonization was adversely affected in response to allelopathy.