Abstract
The regular pruning in the cultivation of kiwifruits (Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson) is necessary to maintain fruit productivity and quality, and the pruning generates a significant amount of wastes. In this study, allelopathic activity of pruning branch wastes was investigated to discover beneficial applications of the wastes. An aqueous methanol extract of pruning branch wastes inhibited the growth of cress (Lepidum sativum L.), lettuce (Lactuca sativa L.) and alfalfa (Medicago sativa L.) and weed species, Lolium multiflorum Lam., Vulpia myuros (L.) C. C. Gmel., and Echinochloa crus-galli (L.) P.Beauv. Significant reductions in the growth were observed as the extract concentration was increased. The effectiveness of the extract varied by these plant species. The extract was then separated by several chromatographies with monitoring the inhibitory activity and the most active substance in the extract was isolated. The substance may work as an allelopathic agent because of its growth inhibitory activity. The present research suggests that kiwifruit pruning branches wastes may have allelopathic activity and be potentially useful for weed control in several agricultural field conditions. Further investigation is, however, necessary in the field conditions to develop the practical application of the pruning wastes.
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