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Volume 1996, Issue 82
Displaying 1-6 of 6 articles from this issue
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Kunio OKANO, Kiyoshi MATSUO, Koji CHUTANI1996 Volume 1996 Issue 82 Pages 1-8
Published: January 31, 1996
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSInformation on the changes in photosynthetic activity of tea (Camellia sinensis L.) leaf with its growth is important for developing an appropriate skiffing practice, by which canopy photosynthesis can be maintained at a higher level. In the present study, morphological and functional changes of growing tea leaf was investigated during the period of the first flush by the use of oxygen electrode.
Leaf continued to expand by 35 days after the leaf unfolding. Respiratory activity decreased with leaf development and reached to a steady level at the full expansion. Both photosynthetic activity and leaf dry weight attained their maximum values by 45 days after the leaf unfolding. However, specific leaf area (SLA), an indicator of leaf thinness, continued to decrease and reached to a minimum value two months after the leaf unfolding.
Photosynthetic activities of over-wintered leaves and lower leaves on the first flush shoot rapidly declined with the growth of the first flush. By the removal of growing new shoot, light penetration onto the autumn skiffing surface increased and the rapid decline of photosynthesis in the remaining leaves were prevented. These results suggest that the light condition may affect the senescence of the mature leaves.
Total nitrogen concentration (% on dry weight basis) rapidly decreased with the leaf growth and reached a steady level at the full expansion. On the contrary, absolute amount of nitrogen within a leaf continued to increase by two months after the leaf unfolding. These results clearly indicate that the rapid decrease of nitrogen concentration with the leaf growth is not due to net decrease of nitrogen but due to vigorous increase of leaf dry weight as compared with nitrogen accumulation.View full abstractDownload PDF (542K) -
Case Using Flowering Date of Cherry TreeHiroyuki IRIKI, Toshimichi WATANABE, Tetsuji SABA1996 Volume 1996 Issue 82 Pages 9-14
Published: January 31, 1996
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSFlowering date of cherry tree was examined as a biophenology for estimating the optimum plucking time of 1st crop in tea plants.
Highly significant correlation was observed between the plucking time of the 1st crop and the flowering date (r=0.969**) or full bloom date (r=0.930**) of cherry trees. The mean differences between the actual plucking time and the plucking time estimated from the flowering date and the full bloom date were 0.9 and 1.7 days, respectively. The plucking time of the 1st crop could be successfully estimated by linear regression equations obtained from each two flowering parameters.View full abstractDownload PDF (319K) -
Masataka YAMASHITA, Toshio TAKYU, Tetsuji SABA, Kazuhito KUGIMOTO, Kaz ...1996 Volume 1996 Issue 82 Pages 15-20
Published: January 31, 1996
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSTea production areas in western Japan were struck by unusual high temperature and drought during the summer season in 1994. Drought injury in northern Kyusyu was especially severe. In the tea fields of Saga tea experiment station where located in northern part of Kyusyu, root activity of injured plants was estimated by the activable tracer method using europium (Eu) as a tracer in late November and assessed within a 20cm-deep upper soil layer at a rain dropping line between rows. Effects of drought injury on the root activity in the autumn season and the first crop production in the next year were investigated. Drought injured not only aerial parts but also roots. Severer a damage in aerial parts, greater a deterioration in root activity. Drought depressed the yield of the first crop in the next year. A reduction in root activity by drought injury would affect the production of the first crop in the next year along with the deterioration in the growth activity of aerial parts.View full abstractDownload PDF (368K) -
Toru KUBOI, Junji INAGAKI, Naoharu WATANABE, Masayuki SUZUKI1996 Volume 1996 Issue 82 Pages 21-27
Published: January 31, 1996
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSA personal computer system for processing GC and LC data was constructed, which was composed of (1) recording of signals from a detector, (2) analysis and modification of chromatograms, and (3) file conversion to the form available for commercial softwares. The second functions such as baseline subtraction, addition of a constant value, log conversion, smoothing and averaging, made it possible to modify original chromatograms. For the purpose of visualising the composition of tea constituents, the processing system was applied to GC (for flavors) and LC (for free carbohydrates and catechin/caffeine) chromatograms. By the aid of commercial graphic softwares, new styles of chromatograms were drawn.View full abstractDownload PDF (420K) -
Toshio HARA1996 Volume 1996 Issue 82 Pages 29-34
Published: January 31, 1996
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSDownload PDF (324K) -
1996 Volume 1996 Issue 82 Pages 36-74
Published: January 31, 1996
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSDownload PDF (2038K)
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