Chemical Difference of the Tea Leaves between Spring and Summer Crops
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概要
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It was an well-known fact that the ordinary tea leaves contained about 5% of nitrogen in spring and about 3% in summer, but the reason why the depression of the nitrogen content occurred during these seasons has not yet been confirmed.<BR>With the purpose of solving this problem, some experiments were performed from 1952 to 1954, by comparing summer crops one of which harvested with regular plucking, the others had not been plucked or checked the flushing with MH-30 spraying in the preceeding season.<BR>In these experiments, the yield and nitrogen content of the regularly plucked tea bush decreased in the order of 1st, 2nd, and 3rd season, and tannin content varied in the reverse direction as many chemical analyses had shown previously.<BR>The bush unplucked in the preceeding season produced lower yield and the crop was poorer in nitrogen content and higher in tannin than the control. But, as the total amount of the chemical component harvested in the crop depended upon the yield, both nitrogen and tannin deprived were larger in the control.<BR>The bush which was checked its flushing by MH spraying in spring could not produce so rich leaves in nitrogen in summer as the control bush had produced in spring.<BR>The chemical analyses of mature leaves also showed the fact that the nitrogen did not seemed to be reserved in the leaves during the season when the flushing had been checked.<BR>As the results of 3-year's experiments, any proof for explaining the reason why the summer crop had lower nitrogen content was not obtained from the point of view of nitrogen absorbing. period from the tea root.
- 日本茶業技術協会の論文
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