Determination of the geographical origin in different soil parent materials of tea [Camellia sinensis] with inorganic element composition
2007
Uchimura, K.(Kagoshima-ken. Inst. for Agricultural Development, Chiran (Japan). Tea Division) | Katsuda, M. | Miura, N.
The objective of this study was to determine the geographical origin of differential soil parent materials (volcanic ash, andesite, Shirasu, granite) of tea leaves with inorganic element composition. In addition, we also examined the varietal difference of the contents of the inorganic elements in the tea leaf by carrying out studies using the main cultivar cultivated in Kagoshima Prefecture and obtained the following results. 1) Varietal difference was observed in Mg, Ba, and Cu contents when the three and a bud was analyzed, while only difference in Ba content was observed when crude tea was analyzed. 2) Principal component analysis of 12 elements (K, Ca, Mg, Al, B, Ba, Cu, Fe, Mn, Ni, Sr, and Zn) in crude tea was carried out. Ba, Ca, and Sr, which the factor loading was high in the first principal component tended to classify Shirasu and other soils. Al and Mn, which showed factor loading was high in the second principal component tended to classify approximately volcanic ash and andesite or granite. 3) Based on linear discriminant analysis (LDA), 6 elements (Ba, Mn, K, B, Sr, and Zn) were found to be effective in determining the geographical origin of 4 different parent materials of soil. After examining 26 samples of crude tea not using for modeling of the reliability of got model, it was classified 73% correctly. 4) Five elements (Mn, Ba, K, Ni, and Zn) were found to be effective in determining the geographical origin of 2 groups of volcanic ash and other soils; LDA could classify these soils with 80% accuracy.
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