Abstract :
The objectives of the study were to examine the allelopathic effect of different concentrations of leaf, root, bark, fruit kernel and seed aqueous extracts of Moringa oleifera on the germination of Vigna radiata cv. BU Mung 4 In germination test of mungbean at laboratory, five sets of experiment each for leaf, root, bark, fruit kernel and seed aqueous extracts were conducted simultaneously. There were six treatments having different concentrations of extracts (2.5, 5.0, 7.5, 10.0, 12.5 and 15.0%) of these plant parts and one control treatment (distilled water). Growth and yield performances experiment were conducted with root extract only having four different concentrations (2.5, 5.0, 7.5 and 10.0%) and one control treatment. Both laboratory and field (pot) experiments were conducted in Completely Randomized Design (CRD) with four replications. The control treatment was only distilled water. The result showed that the rate of germination of V. radiata decreased with the increase of aqueous extract concentration, irrespective of plant parts. The rate of germination was found to suffer more when treated with 10.0, 12.5 and 15.0% extracts. Among the plant parts root and bark aqueous extract were found to inhibit mungbean germination more than the other plant parts used. The inhibitory effect of leaf, fruit kernel and seed aqueous extracts were almost similar, while those were relatively less than bark and root extracts. The effects of light and dark conditions on the rate of germination were not distinct. Therefore, the study revealed that allelochemicals released from different plant parts of M. oleifera impeded the rate of germination in laboratory condition.
