Abstract
Allelopathic Effects of Aqueous Extracts of Ricinus communis L. on the Germination of Six Cultivated Species
Highlights
Some plants may inhibit germination, emergence and subsequent growth of other plants by exuding toxic substances
In this study we investigated the allelopathic effect of root, twig, leaf, seed and pericarp water extract of R. communis on the germination and root growth of six cultivated species: Corchorus olitorius, H. vulgare, C. arietinum, M. sativa, T. foenum-graecum and L. culinaris
High inhibitory effect on germination of all studied species was observed with leaf and pericarp water extract and low inhibitory effect was reported with root, seed and twig aqueous extract (Figs. 1-6)
Summary
Some plants may inhibit germination, emergence and subsequent growth of other plants by exuding toxic substances These substances are called allelopathic chemicals or allelochemicals and the process is called allelopathy. Ranging from cool temperate moist to wet through tropical desert to wet forest life zones, castor bean is reported to tolerate annual precipitation of 2.0 to 42.9 dm annual temperature of 7.0 to 27.8°C and pH of 4.5 to 8.3 It grows best where temperatures are rather high throughout the season, but seed may fail to set above 38°C for an extended period. In this study we investigated the allelopathic effect of root, twig, leaf, seed and pericarp water extract of R. communis on the germination and root growth of six cultivated species: Corchorus olitorius, H. vulgare, C. arietinum, M. sativa, T. foenum-graecum and L. culinaris
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