Accumulation of heavy metals in tea leaves and soils: a case of Sri Lankan tea plantation Online publication date: Fri, 13-May-2022
by I.D.U.H. Piyathilake; E.P.N. Udayakumara
International Journal of Agriculture Innovation, Technology and Globalisation (IJAITG), Vol. 2, No. 4, 2021
Abstract: The application of herbicides is one of the most convenient weed management techniques available in Sri Lankan tea plantations. Thus the prime aim of this study was to determine the effects of herbicides on fresh tea leaves, processed (black) tea leaves, and tea soils. The microwave digestion system and atomic absorption spectrometer (AAS) were mainly used to determine the levels of metal contaminations of fresh tea leaves/black tea and tea soils. The results revealed that Zn, Fe and Pb levels of soils of herbicides applied tea plantation are significantly higher (p < 0.05) than the soils of herbicides free plots. Further, the results showed that Pb levels of green leaves and black tea are slightly higher (p < 0.05) in herbicide-treated plots. Overall, the present study gives insights into the heavy metal contamination levels in soils, green leaves, and black tea under chemical weed management systems in Sri Lanka.
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