The study was conducted in the northeastern state of Mizoram in India to find out the allelopathic effect of trees on agricultural crops. The study was conducted in a bioassay culture and a pot culture. The following results were received:
· In the bioassay culture, the germination and radicle length of all food crops decreased in leaf and bark extracts of Aporosa octandra, Anthocephallus chinensis, and Albizzia procera compared with the control, except the radicle length of Glycine max in the bark extract of Anthocephallus chinensis.
· In the pot culture, Glycine max was the most resistant crop (irrespective of trees and growth media), which showed the highest germination (75.28%) followed by Oryza sativa (68.33%) and Brassica campestris (54.44%). The length of crops (irrespective of growth media and crops) was the largest (86.39 cm) in combination with Anthocephallus chinensis, followed by Albizzia procera (83.85 cm) and Aporosa octandra (81.85 cm).
· Dry matter production of crops was highest in Anthocephallus chinensis (1.06 g/plant) followed by Aporosa octandra (0.83 g/plant) and Albizzia procera (0.81 g/plant).
Thus, we concluded that the order of tree suitability for crops was Anthocephallus chinensis > Albizzia procera > Aporosa octandra and that of crops to trees was Glycine max > Oryza sativa > Brassica campestris.Basotra, R., Chauhan, S. & Todaria, N. P. 2005. Allelopathic effects of medicinal plants on food crops in Garhwal Himalaya. J. Sustainable Agricult., 26, 43–56.
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