Allelopathic effect of aqueous and alcoholic extracts of green tea on pigweed (Amaranthus retroflexus) growth stages

Document Type : Research paper

Authors

1 M.Sc., Dept. of Agricultural Science, Naragh Branch, Islamic Azad University, Naragh, Iran

2 Assistant Professor, Dept. of Agricultural Science, Payame Noor University (PNU), Iran

3 Assistant Professor, Dept. of Agricultural Science, Naragh Branch, Islamic Azad University, Naragh, Iran

4 Ph.D, Barij Essence Medicinal Plants Research Center, Kashan, Iran

Abstract

In order to investigate the allelopathic effects of aqueous and alcoholic extracts of green tea leaves (Camellia sinensis L.) on the growth stages of redroot pigweed (Amaranthus retroflexus), an experimental study was conducted in a factorial design within a completely randomized block design with three replications in the research greenhouse of Barij Essence Company. The experimental treatments included the application of aqueous and alcoholic extracts of green tea at three concentrations of 50, 75, and 100 percent, as well as three control treatments (2,000 ppm 2-4-D herbicide, distilled water, and 70 percent alcohol) at three growth stages, five and seven-leaf, and stem elongation. The results showed that both aqueous and alcoholic extracts of green tea significantly reduced the growth indices in redroot pigweed, and the inhibitory effect was not significantly different from that of the herbicide 2-4-D in most traits. The alcoholic extract of green tea had a greater inhibitory effect on growth compared to the aqueous extract. The highest inhibitory effect was observed with the application of the extract at the five-leaf stage of redroot pigweed. The application of 75 percent alcoholic extract in the five-leaf stage resulted in the shortest root length (13.16 cm) and total dry matter of the plant (0.57 g). Spraying at the stem elongation and five-leaf stages had the highest and lowest dry root weight, which was 0.79 g and 0.25 g, respectively. Since almost all extracts of green tea, whether aqueous or alcoholic, caused a significant reduction in the growth of redroot pigweed, they may be used as a natural herbicide, either in soil or foliar applications, to alleviate the pressure of this weed on agricultural crops.

Keywords

References

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History

  • Receive Date: 03 June 2023
  • Revise Date: 11 July 2023
  • Accept Date: 23 August 2023

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