Allelopathic potential of Tectona grandis leaves extract on dry weight of Vigna mungo and Vigna radiata

This experiment was conducted in order to evaluate the allelopathic effects of the aqueous extract of Tectona grandis Linn. F. on the dry weight in Vigna mungo (Black gram) and Vigna radiata (Green gram). For this present study the seeds of Vigna mungo (Black gram) Var. ADT-3 and Vigna radiata (Green gram) Var. Co.3. were selected. Dried fallen leaves were collected from coastal area of Cuddalore District, Tamil Nadu (South India). The sterilized fifty seeds were placed in petridishes containing different concentrations of teak leaf extract (0, 5, 10, 25, 50, 75 and 100%). The dry weight of both crops Vigna mungo and Vigna radiata were increased in 5% concentrated treatment. All other concentrations showed a decreased dry weight and very low dry weight was observed in 100% treated seedlings. Results showed that low concentrations of T.grandis dry leaves Allelopathic Effect (AE) had significant promotary effect on the Black gram and Green gram seedlings dry weight. The higher applied concentration from aqueous extracts of T.grandis was completely inhibited Vigna mungo and Vigna radiata seedling dry weight by 100% at 50 g compared to its control. However, treatments with higher concentrations had negative effects on rate of seedling dry weight. Low concentrations increase the dry weight increase in both crop seedlings shows promotory effect. As the concentration of T.grandis extract increased dry weight of