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Volume 1969, Issue 30
Displaying 1-14 of 14 articles from this issue
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On the Effect of Retarded Plucking Period upon the Yield and Qualities of Tea in Each SeasonShirô SUGII, Yoshimitsu YANASE, Shizuo TANAKA, Shigeru KIKKAWA1969 Volume 1969 Issue 30 Pages 1-10
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSThe plucking time can be delayed one or two weeks by some chemicals in each season, as reported bfore, so the yield (green leaf) and quality of tea were examined according to the length of delayed period.
As the chemical spraying in the first season can not keep its effectiveness in the second season, it is necessary to spray some chemicals in the second one to retard the growth of shoot.
By this delaying method, the yield may be expected to increase in the first season, but has a tendency to decrease in the second season.
And generally the later the plucking, time in the third season, the less the growth in the next year, but the number of shoot increases somewhat, so the yield can not be expected to decrease, so it is unprofitable to delay the growth extremely in the third season.
The quality of tea can not be effected so remarkably in this test.
So it will be favourable to apply this method in the plucking program in order to regulate the plucking time.View full abstractDownload PDF (485K) -
The Seasonal Change of Fungus Flora in Tea Soils and the Pathogenicity of the Fungus IsolatesSusumu HIROKAWA, Shigeo TAKAYA1969 Volume 1969 Issue 30 Pages 11-18
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSThe seasonal change of fungus flora in three tea soils in which the root rots were occurring was investigated at about two months intervals throughout a year by the plate profile technique.
The total number of fungi isolated and the number of Fusarium increased towards summar, but much Pythium and Cylindrocarpon were isolated in spring and autumn rather than in summer. Many investigators had reported two peaks of soil fungus flora a year, namely in spring and autumn. This disagreement might be in some part due to the difference of testing methods, namely the plate profile and the dilution plate method.
Nine-hundred ninety fungus isolates were finally obtained by the plate profile method 5 or 6 times a year from the three tea soils.These fungi consisted of 244 of Fusarium, 49 of Pythium, 5 of Cylindrocarpon, 3 of Cylindrocladium, 1 of Rhizoctonia and 688 of other fungi. The other fungi isolated were Trichoderma, Penicillium, Mucor, Rhizopus, Aspergillus, Spicaria, Gliocladium, Stemphylium, Alternaria, Cladosporium, Helminthosporium, Cephaliophora, Nigrospora and so on.
Among these fungus isolates, 30.9% of Fusarium, 55.6% of Pythium, 100% of Cylindrocarpon and some others including Cylindrocladium and unidentified Phycoinycetes showed the pathogenicity against a piece of tea rootlet in laboratory test.
Pathogenic Fusarium, Pythiurn and Cylindrocarpon were frequently isolated not only from the affected tea soils but from the root rot free tea soils.
It was suggested that these potentially pathogenic fungi were widely distributed in many tea fields.View full abstractDownload PDF (540K) -
On the Root Development, Deterioration of the Rootlet with Regard to the Physical Properties of Soils in the "Root Rot Disorder" Tea FieldsSusumu HIROKAWA, Shigeo TAKAYA1969 Volume 1969 Issue 30 Pages 18-25
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSPhysical properties of soil, distribution and deterioration of rootlet were investigated in 11 tea fields which had various extent of damage of the root rot disorder in Shizuoka and Aichi Ken.
The 11 tea fields were divided into following three groups according to the state of root rot and the probable causal agents.
Group 1. In 4 fields, some inferior physical properties of soil were seemed to be mainly concerned in the disorder. In such tea fields, the soil had smaller air phase and the root development was poor or only seen near soil surface.
Group 2. In 3 fields, "Tenchigaeshi" (turning over the soil about I m. depth) before planting might be pointed out as one of the most important cause of the disorder. As the unfavorable underlayer soil was exposed to near surface by this treatment, the root growth was generally repressed.
Group 3. In 4 fields, other factors except soil physical properties, such as microbial, nutritional and other agents might be concerned in this disorder. In these tea fields, much rotted roots were usually observed.
Among these 3 groups, tea field belonging to group 3 only showed some disease-like aspects of this disorder.View full abstractDownload PDF (433K) -
The Toxic Effects of Various Insecticides and Acaricides on the Resistant Mites to Phenkapton and EstoxMasaru OSAKABE1969 Volume 1969 Issue 30 Pages 26-31
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSThe author reported in the previous paper (1968) that the resistant mites to Phenkapton and Estox (O, O-dimethyl s-(1-methyl-2-ethyl-sulfinyl)-ethyl phosphorothioate) had widely distributed in Japan tea fields.
This paper showed the toxic effect of various insecticides and acaricides on the resistant mites to Phenkapton and Estox.
As a result in the laboratory test, Kelthane, Chlorobenzilate, Milbex (4-chlorophenyl 2, 4, 5-trichlorophenylazosulfide and Dimite mixed), Newmite (Ovex, Aramite and Dimite mixed), and Acricid proved to be effective on the resistant mites, but some organophospborous compounds such as Phenkapton, Estox, EPN, Imidan, Vamidothion, and Malathion showed less toxic.View full abstractDownload PDF (381K) -
Turuyoshi FURUNO1969 Volume 1969 Issue 30 Pages 32-36
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESS -
Fumio OKADA, Kôzô FURUYA1969 Volume 1969 Issue 30 Pages 37-43
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSFluorine content of several organs of tea plant (bud, young leaf, mature leaf, stem and root) was determined by the colorimetric method with thorium-neothrin. The effect of supplying sodium fluorine on the fluorine content of tea leaf, and the extracting rate of fluorine from tea with water and organic solvents were also investigated.
It was found that the fluorine content of tea leaf increased about 2-6 times by supplying sodium fluoride in both pot and field culture and fertilizing superphosphates also increased the content, in comparison with inorganic nitrogenous fertilizers.
All parts of tea plant contained some quantity of fluorine and especially. the mature leaf contained the most of all. No significant difference of the content was observed between the stem and the root.
Upon standing for 24 hours at room temperature, fluorine in tea was extracted about 60-80%, 50-60% and 40-50% of the total with hot water, ethanol and ethyl ether, respectively.
Instant tea, made from fluorine-enriched tea leaves by feeding with sodium fluoride, contained 150-500 p.p. m. of fluorine.View full abstractDownload PDF (4206K) -
The Infrared Spectra of Various Humic AcidsKenjirô IKEGAYA1969 Volume 1969 Issue 30 Pages 44-51
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSThe infrared spectra of humic acids from huminlike materials (lignin, rice straw compost, peat and nitro-humic acid) and various soils (red yellowish, volcanic ash and "Kuroboku" soil) were determined using the KBr-disk method.
The results are summarized as follows
1) According to the infrared spectrum, it was detected that every humic acid contained such substituent groups as hydrogen-bonded OH, and aliphatic CH groups, COOH, C=O' C=C and various C=O bonds, and consisted of various aromatic and aliphatic compounds including phenoles, quinones, ethers and alcohols.
2) From the pattern of these spectra, humic acids from various soils were classified into three types, namely, red yellowish, volcanic ash and "Kuroboku" soil humic acid.
3) In the infrared spectrum of red yellowish soil humi acid, a fairly sharp absorption band was present at 1025 cm-1 indicating the presence of primary alcohols and ethers, and the carboxyl group content was less than the other humic acids by the weak absorption band at 1690-1720 cm-1 (COOH group).
4) In the infrared spectra of humic acids from nitro-humic acid, rice straw compos and red yellowish soil, a weak absorption band occurred near 1540 cm-1 indicating the presence of nitro-group (C-NO2).
5) In the spectrum of humic acids from volcanic ash and "Kuroboku" soil, three strong absortion bands were present at 1690cm-1-1720cm-1 (C=O of COOH group), 1612 cm-1 (C=C stretching polymeric aromatic ring) and 1250 cm-1 (C-O of COOH group), and the other bands were weak.
6) The weak absorption band was present at 1925-2000 cm-1 in the humic acid from Makinohara "Kuroboku" soil.View full abstractDownload PDF (489K) -
Hiroshi WATANABE, Setsuko NOMURA1969 Volume 1969 Issue 30 Pages 52-67
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
JOURNAL FREE ACCESSThe authors have carried out a series of experiments on a few fertilizers contained pentachloro phenolate for five years from 1963 to 1967. The effects as a fertilizer or herbicide in the tea field and the influences upon the qualities of tea were investigated.
The results were summarized as follows.
1. The growth of tea plants fed with PCP-fertilizer was not shown any evident difference as compared with the control, and the yield was not inferior at all to the control.
2. The deteriolation of quality of tea due to the peculiar stimulant smell of PCP was not recognized.
3. The evident effect for weeding by PCP (2kg. per 10 are) was recognized, so the use of PCP-fertilizers in the tea field might be expected to save farming labour.
4. There were no remark able differences in effectiveness among some kinds of these PCP fertilizers and also little difference directions of sprinkling over or mixing with soil.View full abstractDownload PDF (3499K) -
1969 Volume 1969 Issue 30 Pages 68-103
Published: January 31, 1969
Released on J-STAGE: July 31, 2009
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1969 Volume 1969 Issue 30 Pages e1a
Published: 1969
Released on J-STAGE: July 31, 2009
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1969 Volume 1969 Issue 30 Pages e1b
Published: 1969
Released on J-STAGE: July 31, 2009
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1969 Volume 1969 Issue 30 Pages e1c
Published: 1969
Released on J-STAGE: July 31, 2009
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1969 Volume 1969 Issue 30 Pages e1d
Published: 1969
Released on J-STAGE: July 31, 2009
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1969 Volume 1969 Issue 30 Pages e1e
Published: 1969
Released on J-STAGE: July 31, 2009
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