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Volume 1980, Issue 51
Displaying 1-10 of 10 articles from this issue
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Kiyoharu MAGARI, Satoshi AOKI, Aogu NAKAYAMA1980 Volume 1980 Issue 51 Pages 1-6
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSThe time course of defoliation of old tea leaves and its varietal differences were investigated.
The defoliation was mainly divided into three types.
1) In the early days of winter and spring, leaves were mechanically shed. 2) And these mechanical injuries in the petiole proceeded to shed again at May. 3) From May to October leaves happened to shed physiologically. Moreover pests and disease also gave rise to the defoliation.
As to the varietal differences of defoliation, especilly physiological one, Benihomare shed its leaves between May and June and Yutakamidori shed between August and September. While Tamamidori did stationarily.
The amounts of defoliation were the least in Yutakamidori and the most in Yabukita.
The defoliation was dependent upon the light intensity, so that leaves attached to the inner or lower parts of tree shed more than those to the outer or upper parts. By plucking new sooots the defoliation was reduced, showing the corre ?? ation between the growth of shoots and the defoliation. Leaves having axillary buds shed less than those having no ones.View full abstractDownload PDF (1712K) -
Kiyoharu MAGARI, Satoshi AOKI, Aogu NAKAYAMA1980 Volume 1980 Issue 51 Pages 7-10
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSThe differences of defoliation between Yutakamidori, resistant species to the defoliation and Yabukita, comparatively sensitive one were investigated.
The abscission zone of petiole of Yutakamidori inclined to the shoot, while that of Yabukita was paralleled to the shoot. This finding means that the petiole of Yutakamidori can maintain the leaf blade more efficiently than that of Yabukita. The leaf area of Yutakamidori was small, which reduces the rseistance to the wind and causes to reduce the defoliation. And the sectional areas of vessel were larger than those of Yabukita, which gives the resistance to the mechanical force to the petiole.
In spite of having large sectional area of vessel in Yutakamidori, the numbers of stomata per one leaf were small and the amount of transpiration was not so large. These findings show the possibility of fast restoration against the water stress.View full abstractDownload PDF (255K) -
Mitoshi MAEHARA, Katsuhiro HAKAMATA1980 Volume 1980 Issue 51 Pages 11-21
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSOne year old clones of "Yabukita" were fertilized with various levels of nitrogen in solution culture, maintainning all other nutrients at adequate levels.
Plants were sampled and their various parts were analysed for total-N, water soluble-N and free amino acids after eight weeks when the calibration curve relating the growth to nitrogen addition had just exhibited the full range through deficiency to toxic zone to estimate a critical level of nitrogen for tea growth. The estimates were 4.5% in young matured leaves, 4.0% in old leaves and 2.7% in rootlets in total nitrogen contents. In form of water soluble nitrogen and its ratio to total nitrogen, those estimates were found to be 1.4% and 30% in young matured leaves, and 1.3% and 50% in rootlets respectively. At critical level, tea absorbed 640 mg of nitrogen per 100g (0.64%) of it's fresh weight. Furthermore, from the investigations on yield and nitrogen contents of plucked shoots and old leaves at the first crop season in the following year, it was suggested that the critical level for tea yield was identical to that for the tea growth.
It was also observed that there seemed to be extremely narrow margin between the critical level and the toxic level of nitrogen ; so tea appeared to have very poor capacity for luxurious absorption of nitrogen, and that the fatal concentrations of total nitrogen due to shortage and excess of it were 1.4% and 4.3% in the old leaves and 0.7% and 3.3% in the rootlets respectively. Accordingly it was considered that the range of nitrogen concentration in tea might be much more narrow as compared with other nutrients.
Although the concentrations of total free amino acids, theanine, arginine and the other amino acids in plucked shoots at the first crop season increased as more nitrogen was absorbed, and they all attained maximum level at critical level of nitrogen.
In old leaves, however, they tended to increase toward excessive to toxic zone of nitrogen, suggesting that toxic level of nitrogen might prevent them from translocating to the developing shoots probably because of physiological disorder.
From these results, it will be inferred that the critical level of nitrogen for tea quality might not be different from that for the growth or yield.View full abstractDownload PDF (718K) -
Katsuhiro HAKAMATA, Kôzô ISHIGAKI1980 Volume 1980 Issue 51 Pages 22-29
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSOne year old clones of "Yabukita" were fertilized with various levels of potassium in solution culture. Potassium application rates were seven grades (0K-6K) and 25 ppm of potassium concentration was taken as one unit of K, maintainning all other nutrients at adequate levels.
Their growth were investigated and also their various parts were analyzed for potassium and chemical components to estimate a critical level of potassium for tea growth.
The best growth of tea plant was 1K and 2K, 3K, 0K, 4K, 5K and 6K followed in this order. With increasing levels of potassium application above 4K, the growth dropped remarkably, and reduction of root weight and rot of root occured by plucking of 1st and 2nd crop then.
In plucking time of 1st crop, potassium content as a critical level was estimated to be 2.2% in plucked shoots, 1.3% in upper old leaves and 0.56% in stems, respectively. At critical level, tea absorbed 360 mg of potassium per 100g (0.36%) of fresh weight.
Phosphate content of tea leaves increased with increasing levels of potassium application but calcium and magnesium contents of tea plant decreased inversely.
In the plucking time of 1st crop, total amino acid and theanine contents of plucked shoots decreased with increasing levels of potassium application. Theanine content of old leaves also decreased, but arginine and serine contents increased inversely.
Caffeine, tannin and free-reduced sugar contents of plucked shoots of Its crop decreased with increasing levels of potassium application. Caffeine contents of old leaves decreased in the same way as plucked shoots, but it was not found a certain relation between tannin content of old leaves and potassium application.View full abstractDownload PDF (469K) -
Satoshi AOKI, Aogu NAKAYAMA1980 Volume 1980 Issue 51 Pages 30-32
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSOver-wintering leaves of Yutakamidori and Yabukita have not active source function (that is very low photosynthetic activity) and active sink function(low TAC content) at July. Yutakamidori is restored from water stress more rapidly than Yabukita. And the former sheds leaves less than the later.View full abstractDownload PDF (172K) -
Takashige TERADA1980 Volume 1980 Issue 51 Pages 33-37
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSDownload PDF (6375K) -
The Spreading State and Problems of Clonal Tea Varieties in Main Tea Producting Prefectures of Japan1980 Volume 1980 Issue 51 Pages 38-68
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
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1980 Volume 1980 Issue 51 Pages 77-89
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSDownload PDF (815K) -
1980 Volume 1980 Issue 51 Pages 90-99
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSDownload PDF (772K) -
1980 Volume 1980 Issue 51 Pages 100-109
Published: June 15, 1980
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSDownload PDF (680K)
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