首页|Tea-Grown Soils and Tea Quality in Sichuan and Chongqing, China
Tea-Grown Soils and Tea Quality in Sichuan and Chongqing, China
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Made teas and typical tea-grown soils in Sichuan and Chongqing were collected to investigate soil nutri-ents, related soil properties and tea quality. The tea-grown soils in Sichuan and Chongqing are distributed mainly in mountainous areas. The high annual precipitation (over 1 100 mm), precipitous soil slopes, low cohesion among soil particles and high soil porosity suggested that intensive erosion and leaching might occur in these soils. Moreover, they were very acidic and poor in mineral nutrients such as N, P, K, Ca and Mgexcept S. The average content of total S was 20.40 g kg-1, much higher than that of organic matter in thesesoils, revealing that S in the tea-grown soils existed mainly in inorganic forms and very little in organic forms.Water-extractable S accounted for only a small amount of total S, which showed that most parts of sulfur in these soils were insoluble in water. K and S varied greatly in made teas. The concentrations of N and P,however, varied little in these teas even though they differentiated significantly in the tea-grown soils. Thehigh concentration of nitrogen in made teas could result in the high free amino acids and low polyphenolof teas. Significantly positive correlation was established between potassium and polyphenol in made teas.Teas with high ratio of phenol to free amino acids were usually good in taste and appearance.
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