Chagyo Kenkyu Hokoku (Tea Research Journal)

A New Tea Variety for Green Tea "Ooiwase"

Tamotsu HIDAKA, Yukikazu KURANUKI

1978 Volume 1978 Issue 47 Pages 1-10
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.1

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A new tea variety named "Ooiwase" is a clone suitable for green tea. It was bred by the Cultivation Laboratory of Shizuoka Tea Experiment Station and was adopted as a recommended variety of Shizuoka prefecture in February, 1977. "Ooiwase" originated from the F, hybrid of "Yaeho" (the superior early variety) ×"Yabukita" (the superior medium variety).
"Ooiwase" is a early variety with a intermediate growth habit and numerous shoots. The sprouting time of this variety is about ten days earlier, and the plucking time is about five days earlier than those of "Yabukita", respectively.
The superior characteristics of this variety are vigorous growth, high yield and fine quality. The yield is greater than that of "Yabukita", and its quality is as good as that of the "Yabukita" and it is the best among early varieties and clones. Cuttings of this variety root readily and show good growth after rooting and planting.
The warm areas of Tokai, Kinki and Kyushu regions are adapted to cultivation of this variety. As "Ooiwase" is a early variety, the cultivation is recommended in the warm areas where the tea plant rarely suffers from frost injury or in frostless zones.
One case of the varieties combination for the rational management of the tea industry is as follows ; a early variety "Ooiwase"-a medium variety "Yabukita" - a slightly late variety "Kanayamidori"- a late variety "Okumidori".

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Return Preiod of the Late Frost Damage Influenced by Earliness of Bud Opening of Tea Clones

Saneyuki KAYUMI, Tadayuki TOYAO, Shigemitsu KUROKI

1978 Volume 1978 Issue 47 Pages 11-16
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.11

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The return periods of the late frost damage of the clone Yabukita and other early of late clones were estimated on the basis of the bud opening date of the clones investigated at Makurazaki branch and of the results obtaind from the crop situation experiments of tea which were carried out in various tea areas in Japan.
1. The maximum range of variation in bud opening date of leading clones was regarded as about 25 days. It was recognized that the bud opening date of each clone was its inherent character, consequently, the order of earliness for bud opening and for plucking was scarsely influenced by years and places except for the forst damage occurring to buds or shoots in spring.
2. An index of the risk with respect to the late forst damage of a clone was represented as a value of (A-B) days by subtructing the average date of bud opening of the clone at a place (B) from the average date of the latest frost at the place (A).
The risk of the frost damage of the clone Yabukita in the crop situation experiments was considerably large, because the date of bud opening of this clone was very close to the date of the latest frost.
Highly significant correlation (r=0.96) was confirmed between the risk index value (A-B) and the damage of late frost at the experimental spots. The risk index, therefore, is useful in determining the dangerous area of late frost for tea plants.
3. An exponential regression formula was made up from the return period of Yabukita on tha above risk index (A-B) at various sites of the situation experiment. The formula obtained is given as follows :
y:3.49e^-0.0086x
y:return period (year)
x:index of risk (A-B, day).
4. It was shown that return periods for each of the clones of early or late bud opening could be estimated using the above formula exchanged the index of risk (A-B) for the days expressing the relative earliness or lateness of bud opening of tea clones.
5. Recently, frequency of the occurrence of frost damage is increasing at tea garden in Japan. The auther pointed out, in regard to the above fact, that the frost damage at the tea garden of the clones, such as early clone Yabukita, increased over 1.8-2.4 times as compared with the tea garden of domestic seedlings.

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On the Multipurpose Usage of Sprinkler In the Tea Field

Usage for Protection of Frost Damage and Brine Wind Damage

Haruo KONOMOTO, Yukitaka SUZUKI, Masami KIMURA, Hajime TAKENAKA

1978 Volume 1978 Issue 47 Pages 17-23
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.17

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Formation of Sclerotial Body and Overwintering of the Pathogenic Fungus of the Zonate Leaf Spot of Tea Plant

Toshiyuki NONAKA, Kazuo UEHARA

1978 Volume 1978 Issue 47 Pages 24-32
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.24

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Analysis of the Reproduction of the Kanzawa Spider Mite Tetranychus kanzawai KISHIDA in the Tea Field

Masaaki OBA

1978 Volume 1978 Issue 47 Pages 33-38
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.33

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Simplified Cold Storage of the Egg Masses of the Smaller Tea Tortrix, Adoxophyes sp.

Akira KARIYA

1978 Volume 1978 Issue 47 Pages 39-41
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.39

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Studies on Spider Feuna in a Tea Field (Part 2)

The Seasonal Change of Some Dominant Species in a Tea Fild in Nara Prefecture

Takashige TERADA, Minoru IMANISHI, Kazuki SHINANO

1978 Volume 1978 Issue 47 Pages 42-47
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.42

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Around 1970, the role of the spider in controlling, injurious insects was noticed by Kiritani and others.
We started the study of spider fauna of a tea field in 1976.
The spiders of a tea field were collected by the jarring method, and the field where we collected spiders has not been treated with any insecticides or miticides since our experiment started.
Up to the present, we have confirmed 58 species of spiders there.
Among these, the dominant spiders were found to be Trachelas japonica, Oxyopes sertatus, Oxyopes badius, Pholcus crypticolens Philodromus subaureolus and Xysticus croceus.
It was considered that the spider fauna in the tea field consists of, three different categories. The first category includes those types of spiders that are typical of citrus orchards, P. subaureolus and Salticids ; the second includes those typical of paddy fields, X. croceus and Gnathonarium dentatum and the third consists of those unique to tea fields, Pholcus crypticolens T.and japonica.

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Distribution of the Chemical Constitutents in Different Position of Tea Shoot

Etsuo MIWA, Hirotsugu TAKAYANAGI, Muneyuki NAKAKAWA

1978 Volume 1978 Issue 47 Pages 48-52
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.48

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Difference of chemical constituents at different position in tea shoot of the first and second crop was investigated.
The content of total nitrogen, tannin and caffeine was decreased in leaves of lower position.
The total nitrogen content was rich in the first crop of green tea.
The tannin and caffeine were rich in the second crop of green tea.
Each content of free reducing sugar, flavonol, phosphate soluble pectin and total pectin substance was increased in the leaves of lower position.
The content of (-)-epigallocatechin was rich in leaves of upper position and in the second crop of green tea.
It was showed that in the leaves of upper position for the first plucking season were contained more theanine, glutamic acid, arginine, aspartic acid and serine but less in the second plucking season.
The content of phosphorus, potassium, mange-sium and zinc were rich in the leaves of upper position, while that of calcium, manganese and aluminium were rich in the leaves of lower position.

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Statics Properties of Tea Shoots

Katsuhiro SUZUKI, Hiroshi TAKIYA, Fujio NAKANO

1978 Volume 1978 Issue 47 Pages 53-55
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.53

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The Use of CHASHIKATA Tea Firing Machine

Konomi SAITO, Katsuyoshi OCHIAI, Isoo MATSUMOTO

1978 Volume 1978 Issue 47 Pages 56-61
Published: March 30, 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.56

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ERRATUM

1978 Volume 1978 Issue 47 Pages e1a
Published: 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.47_e1a

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1978 Volume 1978 Issue 47 Pages e1b
Published: 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.47_e1b

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ERRATUM

1978 Volume 1978 Issue 47 Pages e1c
Published: 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.47_e1c

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ERRATUM

1978 Volume 1978 Issue 47 Pages e1d
Published: 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.47_e1d

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1978 Volume 1978 Issue 47 Pages e1e
Published: 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.47_e1e

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ERRATUM

1978 Volume 1978 Issue 47 Pages e1f
Published: 1978
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.5979/cha.1978.47_e1f

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