Research on the Optimum Nitrogen Fertility in Volcanic Ash Tea Field

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  • 火山灰茶園土壌における最適な窒素肥沃度の検索
  • カザンバイ チャエン ドジョウ ニ オケル サイテキ ナ チッソ ヒヨクド ノ

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Abstract

In experiment I, the optimum nitrogen fertility of tea field soils for tea plants was investigated using three kinds of nitrogen fertility fields of 12, 24 and 36 mg per 100g of dry soil in autumn to the 3rd crop season of next year except winter.<BR>In experiment II, each optimum nitrogen fertility of soils in the autumn and spring season for tea plants of the 1st crop was investigated using several nitrogen fertility fields.<BR>1. Over 24 mg nitrogen fertility, the yield, total nitrogen contents of green leaves and qualities of green tea were better than those of usually manured plants.<BR>2. The optimum nitrogen fertility to the 2nd and 3rd crop was N-36 mg and it was higher than N-24mg of that to the 1st crop.<BR>3. The amount of absorbed nitrogen in new leaves of the 1st crop was more increased by raising fertility in spring than in autumn.<BR>About the qualities of green tea, we obtained the same result as the above one.<BR>4. By raising nitrogen fertility in spring to 24 mg total nitrogen contents of old leaves decreased gradually with the growth of new shoots of the 1st crop and tannin contents of new leaves of the 1st crop also decreased.<BR>5. The conclusion is that the seasonable optimum nitrogen concentration in tea fields is about 12mg per 100g dry soil in autumn, about 22mg in spring and about 30 mg in summer, respectively.

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