Possible Role of Cucumber (Cucumis sativus l. cv. Iba’) in Management of Certain Common Weed Species

J. R. Qasem, N. N. Issa

الملخص


Different experiments were conducted to investigate whether cucumber (Cucumis sativus L. cv. Iba’) possess any toxicity to certain common weed species and thus may be incorporated in weed management programs. Experiments were carried out under laboratory and glasshouse conditions. Results showed that full strength aqueous shoot extract of cucumber reduced germination and growth of Amaranthus retroflexus L., Chenopodium murale L., Eruca sativa Mill, Malva sylvestris L., Portulaca oleracea L. and Solanum nigrum L. grown in Petri-dishes. Differences in weed sensitivity to extract were evident; with C. murale and P. oleracea were least susceptible. As low as 1 ml extract added to the Petri-dish was sufficient to reduce germination and growth of all weed species tested, and the effect increased with extract concentration. Water leached from cucumber foliage parts was phytotoxic to all weeds and significantly reduced their germination (except C. murale and P. oleracea) and growth, with more harmful effects on roots than on shoots. Volatiles from cucumber shoot extracts were also phytotoxic and the effect was more pronounced on all weeds with stem and root lengths were disintegrated. Soil-incorporated dried shoot residues enhanced weeds shoot growth but only root growth of C. murale, E. sativa, and M. sylvestris were affected, indicating that most allelochemicals are volatiles in nature. Decayed residues inhibited shoot growth of A. retroflexus and S. nigrum and root growth of all weeds except E. sativa. foliage-applied extract showed no significant effects on weed growth, but soil-applied extract was phytotoxic and reduced germination and growth of all weeds with P. oleracea was the least affected.


الكلمات المفتاحية


Allelopathy, Cucumber, Weeds, Management.

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