The allelopathic potential of the agroforestry trees Ficus subincisa Buch.-Ham. ex J. E. Smith, Bauhinia purpurea L., and Toona hexandra Wallich ex Roxb. was investigated on Triticum aestivum L., Brassica campestris L., and Hordeum vulgare L. test crops. The leaf and bark leachates of trees were both toxic to the germination of the test crops. The inhibition of the germination of test crops was significant. The effects of leachates on test crops were concentration dependent. So, higher concentrations of leaf and bark leachates showed stimulatory effects on the radicle and plumule growth of all test crops. The acceptance of these multipurpose tree species as agroforestry trees in association with field crops decreased in the order Ficus subincisa, Bauhinia purpurea, and Toona hexandra.
The present study was carried out to assess the effect of leaf and bark aqueous extract of Anogeissus latifolia tree on Vigna unguiculata traditional crop to understand the suitability of treecrop combination in agricultural fields. Different concentrations of leaf (1%, 3% and 5%) and bark (1%, 3% and 5%) aqueous extract of A. latifolia were used to study radicle and plumule growth of Vigna unguiculata. The leaf and bark aqueous extract have shown minimum allelopathic effect on V. unguiculata and suppressed/stimulated radicle and plumule growth under different concentrations. The wide distribution of Anogeissus latifolia in a subtropical region of Garhwal Himalaya, provides good fodder fuel wood and timber to the villagers. Therefore introducing Anogeissus latifolia in agricultural field and maintaining the existed trees at boundaries of agricultural fields can be useful to the villagers requirements for the villages and wherever the possible allopathic effect exit can be minimized by lopping the branches of trees and use of naturally flecked off bark for fuel wood purposes
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.
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