V. Conclusion
It is evident from the present study that Albizia saman has allelopathic effect on mustard and Amaranthus, whereas it has less effect on rice. The result could explain the absence of other plant species specially dicot or stunted growth of individuals in the vicinity of the tree A. saman. As the A. saman plant is deciduous, the inhibitors leached out in the soil underneath and the adjoining area has an allelopathic effect on the dicot plant more than monocot. Though allelopathic potential analysis of a species through laboratory bioassays are of great importance, field studies, ecological effect determination and detection of chemical nature of the inhibitors present in the leachate is necessary before incorporating the species in an agroforestry system. So, it is suggested that Albizia saman should only be planted in the locality, not adjoining to any cultivated land