Result of the study of the effect of Albizia saman leaf leachate on the seedling growth of the three test species showed variation in different treatments. In Amaranthus and mustard plants, root lengths were significantly inhibited in all percentages of leaf leachate (Fig-4 & 5). Highest level of root length inhibition (I value 92.26%) was found in mustard seedling treated with 4% leachate. In rice plants, stimulation of root lengths were observed when 1% and 2% leaf leachate was applied. However, application of 4% leachate caused the inhibition of root length in rice (Fig-6). Hypocotyls length was measured in Amaranthus and found to be significantly (p= 0.01) inhibited on 1% leachate application. However, application of 2% and 4% leachate resulted in hypocotyl length inhibition which is not significant statistically (Fig-4). In mustard seedling, the hypocotyl length was decreased progressively with increase in the concentration of A. saman leaf leachate concentration. At 4% leaf leachate treatment, dramatically the hypocotyl did not emerge at all after 3 days of treatment (Fig- 5). The differences in the length of hypocotyl were statistically significant (p