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Volume 1971, Issue 36
Displaying 1-7 of 7 articles from this issue
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Yoshimitsu YANASE, Shizuo TANAKA, Hideya AONO1971 Volume 1971 Issue 36 Pages 1-11
Published: December 20, 1971
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSThe daily and seasonal variation of evapotranspiration on the tea field was measured using the chamber method.
The amount of transpiration from tea plant was large on clear days, but it was small on cloudy and rainy days.
Transpiration began at sunrise, but most of it occurred in the middle of the day, and decreased until sunset. And there was very little transpiration at night.
Evaporation from the soil surface also varied with time, amounting from 1/3 to 1/2 of transpiration from tea plant.
There was considerable seasonal variation in the transpiration from tea plant with the largest occurence in mid-summer and the smallest in the winter. The amount of transpiration in a day was 6 or 7 mm in the summer, 2 mm in the winter, and 3 or 4 mm in the spring and autumn.
At the sprouting time, the amount of transpiration from young leaves was relatively little, but that from matured leaves at plucking time was relatively large.
The amount of transpiration from tea plants was related to climatic factors, and it showed the high correlation to solar radiation, air temperature, and air humidity.
It was thought that the seasonal variation of the amount of transpiration was related to the ability of transpiration owing to plant physiological factor.
Eestimating by the evapotranspiration rate, the amount of water consumption on the tea field was 1, 300 mm in a year, and 120 mm during sprouting time to plucking time of each harvesting season.View full abstractDownload PDF (574K) -
Shigeo TAKAYA, Shigeo HIRAMINE1971 Volume 1971 Issue 36 Pages 12-18
Published: December 20, 1971
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSAs a cause of tea fine root deteriorations, injury by nitrite-N was investigated using excised tea fine roots.
When applied to soils, nitrite-N (Potassium nitrite and Sodium nitrite) was so injurious at the concentration of 20-50 ppm as N on weight basis that discoloration occurred in tea fine roots buried in the soils.
The fact that the injury also occurred in fine roots sustained above the surface of the soils, indicated that the injury was brought by gaseous NO2-N.
Toxity of the water solution of the nitrite-N was very weak.
More than 90% of nitrite-N applied to 3 tea soils, however, disappeared from the soils as gaseous ion in 24 hrs and the toxity of the soils brought by the nitrite-N application also passed away in a short period.
Though soil temperature and moisture did not affect the clitical concentration so much, the duration period of the soil toxity was retarded by low temperature and high moisture.View full abstractDownload PDF (430K) -
Shigeo TAKAYA1971 Volume 1971 Issue 36 Pages 19-30
Published: December 20, 1971
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESS1. BUGBEE and ANDERSON detected C. scoparium by planting alfalfa in field soils and observing subsequent infection of the seedlings. THIES and PATTON also used alfalfa seedlings for detecting the fungus in small soil samples. This report describes an application of the method for detecting 2 Cylindrocladium species from tea soils.
2. C. scoparium caused severe infections of alfalfa seedlings under various conditions in innoculation experiments conducted both in moist chambers and innoculated soils. C. parvum did not cause any disease symptoms on the plants.
3. Infection of alfalfa seedlings by C. scoparium was most rapid at 24°C. At this temperature, the majority of the seedlings damped off in 4-5 days after innoculation. Conidia were formed abundantly on the stems which showed a powdery appearance specific to infection by the fungus. Susceptibilities of 4 varieties of alfalfa tested were not different. Severity of infection was somewhat related to number of conidia innoculated into the soil.
4. A Fusarium species from tea soil caused damping-off of alfalfa seedlings in addition to C. scoparium, although the majority of fungi from the necrotic parts of tea roots or stems, or from tea soils, did not cause any disease symptoms on the alfalfa seedlings.
5. Seedlings of 3 clovers were also found to be susceptible to C. scoparium. "Tetrared", a red clover, was recognized to have such properties as uniform growth, high susceptibility, clear symptoms and abundant sporulation.
6. C. scoparium was simply detected by alfalfa seedlings in naturally infected tea soils, and it is affirmed that this method is applied to assay tea soils for the presence of and to some degree, the amount of the fungus.View full abstractDownload PDF (4946K) -
Storage of Tea Leaves in Double Tray ContainerTadakazu TAKEO, Ryôyasu SAIJYÔ, Takahiro ODA1971 Volume 1971 Issue 36 Pages 31-35
Published: December 20, 1971
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSA double tray container equipment was examined for the storage of plucked tea leaves.
Each 40 kg of fresh leaves was accumulated on a tray (0.4 m2) of duplicated tray made by iron net in a tall container and stored by discontinuous draught method at intervals of half an hour.
The heights of piled leaves reduced to 70-80% of the original value after 6 hours storage. The lower the draught volume was supplied into the equipment, the larger the decrease of the height of piled leaves and the faster the velocity of wind in the intermediate phase of piled leaves. It was thought that the draught area in the sectional phase of piled leaves might become smaller on the condition of lower draught volume by compactly packing of piled leaves during the storage.
When 0.011m3/sec of draught volume was supplied into the equipment containing 80kg of tea leaves, the leaf temperatures in piled leaves on each tray were kept below 25-27°C (the room temperature) for 15 hours and the degradation of tea quality made from this stored leaves was not recognized.View full abstractDownload PDF (236K) -
Storage Test of Flexible Packaged TeasShûichi FUKATSU, Toshio HARA1971 Volume 1971 Issue 36 Pages 36-40
Published: December 20, 1971
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSBy packaging green tea of about 3% moisture content in several plastic film pouches, the storage stability of these pouches for green tea was tested under the condition of 25°C and 80% of relative humidity.
Packaged tea in aluminum-film combination pouch showed the best quality after 3 months, where as tea qualities in other plastic laminate pouches were inferior to the former.
From the results of this investigation, it is thought that the shelf-life of the packaged green tea can be expected for at least 3 months, if green tea is packaged in plastic film pouch in which moisture content of less than 5.5% and ascorbic acid residual ratio of over 70% are retained in green tea.View full abstractDownload PDF (233K) -
Etsurô KUBOTA, Toshio HARA1971 Volume 1971 Issue 36 Pages 41-44
Published: December 20, 1971
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSTo simplify the moisture determination of green tea, the air oven method at100°C, 105°C and 110°C was compared with the standard vacuum oven method.
From the results of moisture determination at three temperature, it was revealed that the air oven method at 105°C for 5 hours was suitable for the determination of moisture in ground tea sample. But moisture contents in green tea (without grinding of the sample) obtained by above mentioned method showed about 0.3% lower than those obtained by the standard vacuum oven method. To determine the moisture of green tea by the air oven method, drying at 110°C for 3-5 hours was necessary.View full abstractDownload PDF (239K) -
[in Japanese]1971 Volume 1971 Issue 36 Pages 45-52
Published: December 20, 1971
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSDownload PDF (444K)
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