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日本的头茶、二茶和三茶的采摘期分别在4～5月、6～7月和8～9月。相对而言,头茶的新梢生长主要依靠上年储存的碳水化合物供应营养物质,随着头茶的生长与采摘,贮存的碳水化合物不断被消耗而减少。因此,二、三茶的生长主要依靠光合作用供应营养物质。据此认为,在头茶采摘时留养一批新叶,对保持二、三茶高强度的光合作用,从而提高二、三茶的产量与品质将起重要的作用。
Japan’s first tea, two tea and three tea picking period were in April to May, June to July and August to September. Relatively speaking, the growth of the shoots of the head tea mainly depends on the nutrients supplied by the carbohydrates stored in the previous year, and the stored carbohydrates are continuously consumed as the head tea grows and picks up. Therefore, the growth of the second and third teas depends mainly on the photosynthesis supply of nutrients. Therefore, keeping a group of new leaves during the picking of the first tea will play an important role in maintaining the high-intensity photosynthesis of the second and third teas and improving the yield and quality of the second and third teas.