Chagyo Kenkyu Hokoku (Tea Research Journal)
Online ISSN : 1883-941X
Print ISSN : 0366-6190
ISSN-L : 0366-6190
Volume 1983, Issue 58
Displaying 1-8 of 8 articles from this issue
  • Correlation to Root Rot Disorder
    Satoshi AOKI, Tadayuki TOYAO
    1983 Volume 1983 Issue 58 Pages 1-6
    Published: December 01, 1983
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
    The first stage of the symptons of root rot disorder are considered to be browning and rotting of fine roots. To clarify the factors which contribute this first stage of disorder, we examined the effect of pruning on the respiration of fine roots mainly using two varieties, 'Yabukita' and 'Fu-jimidori' which are sensitive and resistant to the disorder, respectively.
    The respiration of fine roots decreased proportional to the magnitude of pruning. The decrease was smaller in 'Okumusashi', 'Fujimidori' and 'Sayamakaori' than that in'Yabukita', 'Kurasawa', 'Okumidori' and 'Kanayamidori'. This varietal difference was corresponded with the sensitivity to the disorder.
    Treatment of excess-fertilization also induced the decrease of the fine root respiration. This decrease was slightly larger in 'Fujimidori' than in 'Yabukita'.
    By flooding condition of two days, also, the fine root respiration decreased. The magnitude of decrease and the restoration after the treatment were the same between 'Yabukita' and 'Fujimidori'.
    When tea plants were treated with excessfertilization or flooding condition of two days in addition to pruning, the decrease of fine root respiration was large compared to pruning alone. These results indicate that hard pruning induces the first stage of the symptons of disorder, and both excess-fertilization and flooding condition accelerate the disorder induced by pruning.
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  • Kiyoshi YANO, Kazuaki TUNEKANE, Hideo ABE
    1983 Volume 1983 Issue 58 Pages 7-19
    Published: December 01, 1983
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
    Generally, the irrigation are effective for the protection from the drought injury, but the excessmoisture injury caused by the irrigation sometimes occurres tea planted on poorly permeable soil and poorly drained in subsoil. Therefore, the effects of the underdrain and irrigation on the growth of tea plant cultivated on the clayey and poorly permeable soil were investigated.
    Three-year-old tea plants were used for the experiments. The yield of 1st crop and the spread of plant were increased by the underdrainage treatment. It was considered that the increase of the yield of 1st crop by the underdrain was mainly due to the increase of plucking area because the significant positive correlation was recognized between the yield of 1st crop and the spread of plant. Moreover, it was considered that the increase of the yield of 1st crop was mainly affected by the increase of the gaseous phase ratio of soil down to sublayer by the underdrainage treatment.
    The growth of summer shoot, namley the weight of pruned branches on July 9was increased by both the underdrain and irrigation, however irrigation was more effective. The weight of summer pruned branches was mainly affected by the amount of extracted soil moisture, and the amount of extracted soil moisture was increased by the irrigation and remarkably increase was shown in the plot of underdrain at drought period. The soil moisture was gradually extracted from all soil layer in the plot of underdrain, but the soil moisture was extracted from surface layer only in the non-underdrain plot.
    The growth of autumn shoot, namely the weight of pruned branches on Oct. 28 was increased by the underdrain, and it was decreased by the irrigation without the underdrain. The weight of shoots in a unit area and length of shoot were increased by the underdrain, and they were highly increased by the irrigation in addition to the underdrain. The spread of plant was increased by the underdrain, and decreased by the irrigation with or without the underdrain, and the spread of plant mainly affected the weight of pruned branches. It was considered that the increase of gaseous phase ratio of soil down to the sublayer by the underdrain affected the increase of the spread of plant, and also affected the increase of the weight of autumn pruned branches.
    From the results above mentioned, remarkable effect such as the continuous increase of the gaseous phase ratio in the soil and hastening the growth of young tea plant were shown in underdrainage treatment. Otherwise, the effect of irrigation was recognized at only drought period. Accordingly, it is considered that the supply of air into the soil by the underdrain was more important than the supply of water by the irrigation on the growth of tea planted on the poorly permeable soil.
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  • Mitsuaki KARASUYAMA, Jun MATSUMOTO, Tetsuo FUJISHIMA
    1983 Volume 1983 Issue 58 Pages 20-27
    Published: December 01, 1983
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
    Correlation analyses were made between the yields, qualities of tea leaves and the amount of available nitrogen in tea field soils supplied with farmyard manure. The available nitrogen was determined by the bottle incubation method.
    The results obtained were summarized as follows.
    1. The available nitrogen content of soils increased 3.6 times as much as that of control plot with supplying the farmyard manure of 4 ton per 10 are for 6 years, and the changes in the amount of available nitrogen were not observed during a year.
    2. The amount of nitrogen contained new shoots in 1 st and 2 nd crop seasons gave the highest correlation with the total amount of available nitrogen and inorganic nitrogen in soils, it seemed that the nitrogen uptake by tea plant depends on the amount of both available nitrogen and inorganic nitrogen in soils.
    3. Yields of 1 st crop shoots had a high correlation with the concentration of inorganic nitrogen in soils in the spring, but the 2 nd crop season, the yields had a high correlation with the amount of available nitrogen. On the other hand, quality of green tea in 2 nd crop season had a high correlation with the concentlation of inorganic nitrogen in the spring and summer. Therefore, the following inference can be drawn from above correlation analyses, enriched available nitrogen in soils was more effective on the growth of tea plant than on the qualities of tea leaves, and more effective in 2 nd and 3rd crops than in 1st crop.
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  • Kaoru ÔMORI
    1983 Volume 1983 Issue 58 Pages 28-35
    Published: December 01, 1983
    Released on J-STAGE: December 03, 2009
    JOURNAL FREE ACCESS
  • Yoriyuki NAKAMURA
    1983 Volume 1983 Issue 58 Pages 36-37
    Published: December 01, 1983
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
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  • 1983 Volume 1983 Issue 58 Pages 38-41
    Published: December 01, 1983
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
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  • 1983 Volume 1983 Issue 58 Pages 49-60
    Published: December 01, 1983
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
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  • 1983 Volume 1983 Issue 58 Pages e1
    Published: 1983
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
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