The allelopathic effects of extracts derived from the residues of sorghum stem and maize inflorescence on the germination and growth of okra (Abelmoschus esculentus L.) were determined. Both crop residues (powder) inhibited the growth of okra. The degree of inhibition increased with increase in the concentration of the extracts, thus suggesting that the effects of the extracts from the residues were concentration dependent. Statistical analysis (p = 0.05) revealed that in seeds treated with sorghum stem extract, significant differences were observed in the germination percentage of seeds treated with the 50 g extract concentration when compared to the results obtained in the control experiment. In the other treatments no significant differences were observed when compared to the control experiment. Statistical analyses also revealed that there were significant differences in other parameters such as the speed of germination, number of leaves, leaf area, dry root and shoot weights and the relative growth rate of okra seeds treated with extracts from sorghum stem residues when the results were compared to those obtained in the control experiments. Results obtained from seeds treated with extracts from maize inflorescence revealed that there were no significant differences in the number of leaves at harvest, dry root weight and relative growth rate when compared to the results obtained in the control experiments. Statistical differences were in other growth parameters such as germination, speed of germination, leaf area and dry shoot weights of extract-treated seeds when compared to the control experiments. The results showed that the degree of retardation was more pronounced in seeds treated with extracts derived from the residues of maize inflorescence.
Online ISSN: 1459-0263Year: 2013, Vol. 11, Issue 1, pages 320-323. Publisher: WFL.
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