Phytotoxic influence of agroforestry tree species on food crops in Eastern Himalaya, India

摘要

In bioassay and pot culture, the allelopathic effects of aqueous leaf extracts of Chukrasia tabularis A. Juss., Tectona grandis L., Terminalia myriocarpa Heurck and Muell, and Trema orientalis Blume were determined on crops [Cereals: Oryza saliva L. (cv. Ranjit) and Zea mays L. (cv. Vijay Composite); Legumes: Vigna radiata L. (cv. SG-1) and Vigna umbellata Thumb, (cv. Naga local) and Oilseeds: Arachis hypogeae L. (cv. ICGS 76) and Brassica campestris L. (cv. TS-38). The results showed that the aqueous leaf extracts of tree species significantly inhibited the germination, growth and biomass yield in both bioassay and pot culture environments. The oilseed test crops were more susceptible to toxins present in trees followed by cereal crops. Irrespective of tree species and test crops, germination, shoot length, root length and biomass yield were inhibited by 18.0, 26.5, 26.1 and 50.2%, respectively.