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Allelopathic suppressive effects of Thevetia peruviana L. and Nerium oleander L. leaf extracts on germination and seedling growth of Cyperus rotundus L.

Authors:

U. Januha Begam,

Eastern University, Vantharumoolai, LK
About U. Januha
Department of Crop Science, Faculty of Agriculture
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S. Srikrishnah ,

Eastern University, Vantharumoolai, LK
About S.
Department of Crop Science, Faculty of Agriculture
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S. Sutharsan

Eastern University, Vantharumoolai, LK
About S.
Department of Crop Science, Faculty of Agriculture
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Abstract

This study was undertaken to assess the allelopathic suppressive effects of Thevetia peruviana and Nerium oleander vinegar leaf extracts on purple nutsedge (Cyperus rotundus) tuber germination and seedling growth at the Crop Science Laboratory, Eastern University, Sri Lanka from January to February 2019. Fourteen treatments were imposed viz. Control (T1-no application), 100% vinegar, 100%, 75% and 50% fresh and dry leaf extract of N. oleander and T. Peruviana. Experiment was arranged in a completely randomized design with three replications. Equal sized tubers were soaked in different plant extracts as per treatment structure for a period of two hours before planting. Then leaf extracts were applied to germinating tubers at two days interval for three times. All the management practices were followed uniformly. Germination percentage (%), seedling length, seedling dry weight and seed vigour index were measured ten days after planting. Analysis of variance was performed to determine the effect of treatments on measured parameters and mean separation was done using Duncan’s Multiple Range Test (p < 0.05). Results revealed that germination and seedling growth parameters of purple nuts edge (Cyperus rotundus L.) were significantly affected by different concentrations and forms of T. peruviana and N. oleander leaf extracts. Lowest performances in all measured parameters were observed in dry leaf extracts 100% and 75% N. oleander and 100% T. peruviana applied treatments. This study found that leaf extracts of T. peruviana and N. oleander have an allelopathic suppressive effect against purple nuts edge tuber germination and seedling growth.

How to Cite: Begam, U.J., Srikrishnah, S. and Sutharsan, S., 2020. Allelopathic suppressive effects of Thevetia peruviana L. and Nerium oleander L. leaf extracts on germination and seedling growth of Cyperus rotundus L.. AGRIEAST: Journal of Agricultural Sciences, 14(2), pp.43–51. DOI: http://doi.org/10.4038/agrieast.v14i2.96
Published on 22 Dec 2020.
Peer Reviewed

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