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Asian Journal of Plant Sciences
Year: 2003  |  Volume: 2  |  Issue: 10  |  Page No.: 738 - 742

Suppressive Effects of Aqueous Extracts of Azadirachta indica Leaf on Some Initial Growth Parameters of Six Common Agricultural Crops

A.T.M. Rafiqul Hoque, M.B. Uddin, R. Ahmed and M.K. Hossain    

Abstract: The paper presents the suppressive effect of different concentration of aqueous leaf extracts of Neem (Azadirachta indica) on some agricultural crops e.g. Cicer arietinum L., Brassica juncea (L.) Czern and Coss; Cucumis sativus L.; Phaseolus mungo L.; Raphanus sativus L.; and Vigna unguiculata (L.) Walp. The experiment was conducted in sterilized petridishes with a photoperiod of 24 hours on an average temperature of 29.50C. The result showed that aqueous leaf extract of Azadirachta indica caused significant inhibitory effect on germination, root and shoot elongation and development of lateral roots of receptor plants. The effect was proportional to the concentrations of the extracts and higher concentration had the stronger inhibitory effect whereas in some cases the lower concentration showed stimulatory effect. The study also revealed that inhibitory effect was much pronounced in root and lateral root development rather than shoot and germination.

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