author(s)
Athisaya SB, Raghuram C, Anbarasu and J Sathya

abstract
The present study entitled “Allelopathic Influence of Senna uniflora on Morphological Traits of Vigna mungo” was conducted at JSA College of Agriculture and Technology, Cuddalore, to evaluate the allelopathic effects of plant part extracts of Senna uniflora on black gram (Vigna mungo). The experiment was laid out in a Randomized Block Design (RBD) with three replications and four treatments: leaf extract (T1), stem extract (T2), root extract (T3), and control (T4), with each extract prepared using 50 g of plant material in 50 ml of distilled water.The results revealed that the leaf extract (T1) significantly inhibited seed germination and seedling growth of black gram compared to the control. Shoot length, root length, fresh weight, dry weight, seedling vigour indices (SVI-I & SVI-II), and response index were all adversely affected. In contrast, stem and root extracts (T2 and T3) showed negligible effects on seed germination and seedling growth. The study concludes that allelochemicals are likely concentrated in the leaves of Senna uniflora, causing phytotoxic effects on black gram.