Application of different forms of calcium to tea soil to prevent aluminium and fluorine accumulation

K. F. FUNG, Ming Hung WONG

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Tea Camellia sinensis (L), is a well-known accumulator of aluminium and fluorine from acidic soil. A reduction is desirable as aluminium and fluorine absorbed will leach into the tea liquor through infusion, thus posing a serious threat to the health of consumers. The present study aims to investigate the effects of adding different forms of calcium on Al and F uptake by tea plants, in order to reduce the concentrations of these elements contained in the plants. All true lime materials increased the soil pH and decreased soil extractable Al and F concentrations. There were no (p < 0.05) changes in pH values when CaCl₂ was added, and a slight decrease in Al and F concentrations was observed in the treatments with CaSO₄. Tea seedlings under the addition of CaSO₄ were the tallest and healthiest, followed by CaCl₂, CaCO₃, Ca(OH)₂ and CaO. Seedlings under large doses of Ca(OH)₂ and CaO were dead. Relative growth rates decreased significantly with the increase of calcium compounds except in CaSO₄ treatment. The highest Al concentration was also found in the treatment of 4000 mg CaSO₄ kg⁻¹; it then decreased gradually from 3364 to 933 mg Al kg⁻¹ in leaves. For all treatments in both varieties, F concentrations in leaves were lower than the control (374 mg kg⁻¹). Calcium chloride was a suitable agent for reduction of Al and F uptake by tea plants while maintaining a high growth rate of the seedlings. Copyright © 2004 Society  of Chemical Industry.

Original languageEnglish
Pages (from-to)1469-1477
JournalJournal of the Science of Food and Agriculture
Volume84
Issue number12
DOIs
Publication statusPublished - Sep 2004

Fingerprint

fluorine
Fluorine
Tea
Aluminum
tea
aluminum
Soil
Calcium
calcium
Seedlings
soil
seedlings
Calcium Compounds
Camellia sinensis
uptake mechanisms
Calcium Chloride
liming materials
Growth
acid soils
calcium chloride

Citation

Fung, K. F., & Wong, M. H. (2004). Application of different forms of calcium to tea soil to prevent aluminium and fluorine accumulation. Journal of the Science of Food and Agriculture, 84(12), 1469-1477. doi: 10.1002/jsfa.1842

Keywords

  • Relative growth rate
  • Lime
  • Uptake