1986 Yen Son district has planted 02 varieties in the 23-PH1 QT and 17- KP Lam of the US Tea Company (now American Tea Joint Stock Company Lam), yield 20 tonnes / ha. It is characterized by a big bud, long young. The current yield is 20.3 tons / ha, there a garden of 25 tons / ha. Disease resistance quite especially for green hoppers, the rate at primary timber. Regarding the quality of tea is rated at average level.
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